Sorry, but the U.S. Military is full of perverts and deviants. Drop a bunch of 18-22 year old males into foreign countries and oh my the trouble they find.
It is what it is. But these guys are not a bunch of boy scouts and have sexual practices that would make most civilians blanch. Sorry to burst your bubble but when I was in the Army I had folks showing me pictures of their naked wives. R&R was hookers and booze. I didn't understand it then. I don't understand it now. Just don't kid yourself.
Oh cut the crap! That's normal male behavior. (not everyone is a Christian.)