It's just normal. Girls are more apt to showing emotional signals (hugs, kisses etc) than their guy conterparts. Obviously there will be exceptions, I've never kissed (Like lips, douchebag) or hugged a guy that wasn't close family. As far as manboobs go though..
Yeah, when it comes to guys' doing that they'll be called fags or something, or people will just think they're hecka funny. Or ofcourse, seriously gay.
Me you ask? Straight... In a relationship[with a girl]..