Horomones, maybe? I don't know, that's a little out of the ordinary

Dirty?

I used to do weird shit like that when I was 4-5 years old, but a teenager?...

41 - That's pretty prude of you. I'd be more in favour of sex toys being used instead of regular toys for sex acts.

a little?

Gotta love practice, better than bratz dolls... Not that I have done it..

If he's practicing on a Barbie doll, he's in for a rude awakening when he moves on to women...

what is this hole down there, i haven't seen this b4

Is his name Ken by any chance?

Hopefully he isn't in high school, it's understandable if he is 13, but you should probably talk to him.

People need to practice.

Practice makes perfect?

Wtf. That's some weird fetish

He's just improving !

Ok then... That's a wee bit awkward.. Maybe knock before going in so you don't have to witness something like that again

Maybe just practising if he's in his early teen years. If not, maybe talk to him