But is kissing exclusively for boyfriend and girlfriends only? Do you really need to make the girl your GF in order for you to kiss her? I don't think so. In the 1980's and going back further it works that way but now it's different, a girl can kiss a guy if she wants to or not. This is like kissing your boy bestfriend in the cheek as a "thank you" for what he's done for you. Do you easily let a boy kiss you on the cheek? Not unless he's really cute and you have a huge crush on him, I bet you'll let him kiss you on the cheek.