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Why Do We Kiss?

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Hank gets all up in your face about kissing -- where does it come from, why do it we do it, and do other animals do it? From ancient India to that date you were on last night (which we won't tell anyone about if you won't), we explore the history of snogging and its role in human evolution. Like SciShow? Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids? Check out our awesome products over at DFTBA Records: http://dftba.com/artist/52/SciShow -- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Sources for this episode: http://news.discovery.com/history/history-of-kissing-130214.htm http://www.nytimes.com/2006/04/06/fashion/thursdaystyles/06kiss.html?_r=0 http://www.livescience.com/32464-why-do-people-kiss.html http://www.nypost.com/p/news/opinion/books/birds_don_kiss_it_bees_don_do_it_NmFi5KYTOqDbgoPNf3h7UO/1 http://news.nationalgeographic.com/news/2009/02/090213-valentines-day-kissing.html http://people.howstuffworks.com/kissing.htm http://www.psychologytoday.com/blog/let-their-words-do-the-talking/201212/odd-facts-about-kissing http://www.cnn.com/2009/HEALTH/02/13/kissing.science/
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Text Comments (2275)
Daniel (7 days ago)
I just realised how weird and random kissing is lol. Humans are so funny and strange
narek hardnock (10 days ago)
To think this guy writes romantic novels
phmarriel (10 days ago)
"were swaping spit"... You are so romantic, Hank
Hriday Ramchiary (11 days ago)
1:20
joel serrahn (15 days ago)
DON'T TOUCH ME!!!!!
Wall flower (22 days ago)
since i was younger than now i always asked myself why we are kissing on the lips
Defender ofOasis (24 days ago)
It's interesting how just thinking of being intimate with someone releases oxytocin/dopamine.
SOFIA MERCURI (29 days ago)
pigeons kiss too
christian woldegebriel (1 month ago)
I like how you talk
AMIRABBAS MOHSENIPOUR (1 month ago)
I'm single😁😁😁😁
ROBYN BAILEY (1 month ago)
My boyfriend says it helps lose weight do we do it alot
Tricia Charlton (1 month ago)
Isn't mouth to mouth kissing cultural.
Brian Elton (1 month ago)
Kissing is the juxtaposition of two sets of obiscular muscles in a state of contraction with sounds like a cow pulling its hoof out of soft mud.
Nikki Pop (1 month ago)
*"From there, presumably, people just thought that sucking faces felt all good and tingly, which is a compelling reason to do a lot of things."* Oh, Hank. 2:16
TITO BROZ (1 month ago)
Alexander the great......the biggest Macedonian warrior.Long live Republic of Macedonia..
Huh well maybe making out isn't so bad then, just kidding i'm still terrifyied of it
Kaite 0.0 (1 month ago)
if you like the natural smell of someone/partner that means that you have the opposite immune system. Wait... its nothing bad! Its actually a great thing! That means that if you have a baby, the baby will have a stronger immune system.
Abbie Phillips (1 month ago)
They say romance is dead
m mac (1 month ago)
snootful of pheromones sounds like a great album title
Rhys Logan (1 month ago)
Actually it's really funny, my girlfriend was wondering about this the other day and now I an answer for her
The Best Galaxy (1 month ago)
I cryed all this video. I dont have a lover! It hurts..
cosmosofinfinity (1 month ago)
No way kissing burns calories.
Wenhao huang (1 month ago)
3:07 lol...great for burning calories
TXM (1 month ago)
I want to suck Hank Green all over. Js.
WAR BEYAH (1 month ago)
Clown ass dude has no proof. Let me guess, you believe in evolution huh? GTFOOH
Stevie Cormier (1 month ago)
Count me in the evolutionary camp. The testosterone passing and pheromone selecting are two more reasons to believe it's nature and not learned. The cultures who don't do it are probably either lying, or going against nature.
jaeden (1 month ago)
its 2:30am why am i watching this
Shaunaq Prabhakar (2 months ago)
I heard SAAANSKRIT and unsubscribed immediately !!! You people have no problem pronunciating sun or son then why can't you say Sunskrit...... Not cool
this guy's voice is annoying.
Preetish Kaur (2 months ago)
Pee while kissing 😑 wth 😅
S P (2 months ago)
This comforted my ignorance and now more than ever I want to have my first kiss.
Mike Cogan (2 months ago)
Just fast fwd to 1:23.. save your self the time.
kaishally BTS Army (2 months ago)
i would like to kiss in every sec to burn my calories but main question is here where to kiss ? and with whom and wh gonna kiss kiss me their ? u know where
Peter Pan II (2 months ago)
My first kiss was with a 37 yr old prostitute. I was 16. lmao
Taylah Websdale (2 months ago)
...my family are Australian Aborigines and they all kiss lmao
__kunstler__ (2 months ago)
And here in India kissing in public is taboo 😐👏
yashashwini Nsimha (2 months ago)
Woah... India!?? Really?? ...and we here don't even get to date whom we want...most of the time it's arranged marriages here in India 🇮🇳...the irony....but then again no wonder we are the 2nd most populated country in the world...hmmmm.....
Anaamwinvielotama Beyuo (3 months ago)
Now I'm rethinking my last kiss
Patricia Bafalis (3 months ago)
This video made me rethink my whole entire existence
Nehemiah Joshua (3 months ago)
I hate kiss at
Madaline Nixon (3 months ago)
*face sucking*
Laura (3 months ago)
1:18 lol
Daniel Enochs (4 months ago)
BABY BAKING LOL 😂
Alex Freire (4 months ago)
you are an annoying dude! Dude
Ghetto Lazzerbeam (3 months ago)
Alex Freire who
Kartik Dobhal (4 months ago)
sucking faces
Wyatt Oxley (4 months ago)
The longest I’ve kissed for is an hour. ( ͡°³ ͡°)
Hitori Tamashi (4 months ago)
I could spend alllllllll day kissing my girlfriend
Blooming Beauty (4 months ago)
I love my boyfrend❤ do somone here have a girlfrend/boyfrend???....❤🔥
Snoop Fox (5 months ago)
I just had my first kiss and i can say, see you latter nerds i have ascended to the normie life.
Fantistic (5 months ago)
It's still kind of gross though.. Changing spit.. ugh
Ron White (5 months ago)
They urinated while kissing.
Girl ThatIsAGirl (5 months ago)
Okay so my background is european (more specifically portuguese) the thing is, i was raised mostly in Canada. Here kissing is thought to be more of a romantic thing not a friendly kind of thing. But in Portugal if you see family friends or family you have to kiss them on both cheeks. I normally just kinda touch cheeks cuz im awkward but with older people like grandparents, great aunts and uncles and very old cousins it ends up being a huge kiss on both cheeks. Now my favourite part of this is how one of my mothers good friends has a few kids one is the same age and after a while of flirting i definatly dont mind having to kiss him on the cheeks every now and again. Although a huge problem with the cheek kissing is it differs in each country. Like if a portuguese person sees their italian friend they might end up kissing on the lips becuase if i remember correctly portuguese kisses go left to right and italians go right to left. You can guess what happens most times.
Xano (5 months ago)
Perfect show for learning about forensics. I plan on becoming a forensics investigator someday.
Leonardo Aielo Tassi (5 months ago)
Amost identical to vsauce's video...
colin Paterson (5 months ago)
This should have been presented by a woman not a stubbly faced Hank.
A4Ahimsa (5 months ago)
Kissing on lips was a family/social thing in ancient India. People kiss and kissed by their parents/siblings/friends on lips. Kiss was never associated with sex in Sanskrit literature rather it was just a gentle greeting. People ruined it's cultural value by sexualizing it.
Shelby Sanders (5 months ago)
Me and my friends are 14 and we all had our first kiss
A Few Wonders Conveyed (5 months ago)
Kissing originated from India, isn't it?
vvelvettearss (5 months ago)
I love this channel. there's no distracting music or loud colours and crazy fast annoying editing sound effects so I can really take it in well the facts he's saying. also his delivery and composure is very good enthusiastic, interesting and entertaining, pretty funny too :) . love thus channel unlike buzzfeed and craze tv etc it delivers well side note - I'm going on a cinema date today and now feel really weird about kissing, pheromones and being a female animal xD other side note am I the only one who thinks it's kind of adorable and beautiful that it likely originated from mothers passing food to their offspring. I mean the foods gone now but that's such a tender reason for it :)
Blitz the Dragon (6 months ago)
Love is the strongest drug and could kill you
Dargalanaflitanip (6 months ago)
I actually hate kissing, it's gross and icky and yucky... no, I'm not a kid, I'm 23 and have kissed a few people. I'm just weirdly uncomfortable with physical contact, even hugs.
Doctor Maxi (6 months ago)
I want to kiss this Channel!
Nicki_ Irvin (6 months ago)
Mep
Aesthetic (6 months ago)
Who wants a kiss? 😘💋
RG (6 months ago)
How the heck can you lose weight with kissing??!
David McDonnell (6 months ago)
Its kinda sweet the reason we enjoy kissing is because we want our kids to be healthier
King (6 months ago)
u talk way to fast , gives me headic
MonstaX (6 months ago)
You know what an australian kiss is? It's like a french kiss, but down under
Adam Khan (6 months ago)
I heard jeff sucks up to his wife.
Shaina Badi (6 months ago)
No j me
Do U kno Dey Way? (7 months ago)
Crash course??
jahfree lorainz (7 months ago)
Try finding out where your fluoride intake is coming from and do your best to reduce its intake.
The kiss is considered a sensuous act and it implies that one is comfortable and sincere in the relationship. It is a symbol not necessarily of love but has more to do with trust.
AlexAnimationsYT (7 months ago)
1:32 is that a gorilla shitting a brain
Eloy Jimenez (7 months ago)
I dont lol
Abdulla Nasser (7 months ago)
because it connects out butthole
Chicken Nugget (7 months ago)
😗
Moises Rodriguez (7 months ago)
STD
Edith Soulier (8 months ago)
Sex!!!!!!
Elizabeth Liones (8 months ago)
Im forever alone, so why should I care xd
DarkPhoenix (8 months ago)
Wtf? I always thought it wasnt indian at all.
shay (8 months ago)
Those lips in the thumbnail look dry af.
davidsirmons (8 months ago)
Greeting kisses are just that: a greeting. Amorous kisses are a vestigial 'consuming' of the other person, and signifies a deep 'craving'. Yes, that's what it is.
danny boyo (8 months ago)
Why? Because my cellmate likes foreplay.
Youll Donuttin (8 months ago)
a dogs mouth apartnely is cleaner than a humans mouth
KaramelLolaBunnie91 (1 month ago)
Liri 👽-"Youll Donuttin.....Lies & false!"
Pampos Pampou (8 months ago)
Cyprus is Greek , Turkish Mongols !
Elmina Holcomb (8 months ago)
I think this is more of a theory.
Elmina Holcomb (8 months ago)
Now I don’t want to kiss anymore ewwwww.
yaboi darthsith (8 months ago)
Hey this was made on my birthday!!
Zach Purry (8 months ago)
The thumbnail is terrifying
shinilla luks (8 months ago)
You really have to explain why people kiss. You must not have a emotional intelligence to figure that out. People kiss because they love each other. It's a form of intimacy and affection.
Pedro Pimentel (8 months ago)
2:32 your blood vessels expand? So.. hum... like viagara?
Abbie Knights (8 months ago)
That is why we kiss
Vanna Del Rey (8 months ago)
How you know you’re asexual: you’d rather learn the science and history behind kissing than doing it I’ve kissed a lot of people of both genders and never have I enjoyed it. Only do it cause I enjoy making whoever I’m with feel good, tbh.
Pola B (8 months ago)
Has anyone else thought of teh book Two Boys Kissing?
Lucky Hugs (9 months ago)
Face Battling
NoCraft Games (9 months ago)
It's quite scary how much this guy reminds me of idubbzTV
Alex's Garage (9 months ago)
Well if I was an Australian aborigine I can guarantee I wouldn't want to kiss
Mout M. (9 months ago)
I grew up in Thailand where kissing isn't common behavior. I always thought it was a western way of showing affection. Still today I think kissing is weird.
Crystal Rose (9 months ago)
Does anyone else think the header?...looks like Baekhyun's lips?

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