It looks like the eiffel tower when you high five someone over someone's head? I really don't get the sexual or even rude joke in there? I have no idea! Never heard of that before! :P
Edit! OMG! That's horrible! (I read the answer before me.) Next time you see them, kick them! :D
First of all, don't go in the army just because it will make your father "proud". It is your own life and you shouldn't feel obligated to do something that will make him "proud". You are your own self. Don't be someone your not.
And as for the worry about it being "unlawful" for two guys to get...