Uh, if what I've read is right OP, I think you're being a huge creep. You can't just go around pushing your body up against other people for 'warmth'. A hug is a pretty friendly/exclusive gesture and you can't really just go around giving them out willy-nilly.
If you wanna hug somebody, just hug them. You shouldn't need a scientific explanation for why they are beneficial. If you do, back off dude lol