I wanna encourage you to encourage your son to take a 30 day course(maybe after you confront him... gulp) it's some sort of purity challenge for teens. I highly recommend it. It really helps me in my struggle with sexuality and I'm one step closer everyday to my salvation. It has given me a lot of understanding on what God created sex for.
That boy needs help. This behavior is not very ok.
Anally penetrating your mother is "not very OK" and the boy should take a 30 day course ???????
Hhahahha, she found a magazine with naked men and she thinks that her son have a girlfriend, hhahahaha, and the part about gays, condoms etc. It is more sad than a fun to know that there is people who thinks like that.