Did the nervous patrolling committee scare away all the sexually healthy people with sense of humour off this thread?
Are you for real?
So people who don't think this is funny aren't sexually healthy?
And you don't need to nip it in the bud, or call the school!! (what else? to call the police maybe?). Next thing you'd start punishing toddlers for having an erection.
This is probably the stupidest thing I've read on MN.
Now I understand why quite a few English men are either sexually repressed, or have a completely fake persona when round their parents, esp. mothers, and a whole crazy other life, which their parents would never know about it.
Huh? 
Actually, your whole post is one of the most stupidest I've ever read on MN.
My neighbour thought it was ok to send me drawing pictures of his cock, with messages about my body and how I make him want to ejaculate in his pants when he looks at me. I was 13, he was 15 ish. I guess he was just being a hormonal boy though and thought it was funny while I was petrified and felt violated. He didn't grow out of it though, it started of with just cock drawings, it soon became much worse. If someone had told him how objectifying it was at the start it wouldn't have escalated, who knows.
This isn't just a feminist issue, it's a respect issue. It is disrespectful to draw a jizzing cock with 'nice tits' knowing the mum would read it at some point.
That is not normal behaviour in my eyes. Drawing cocks on notebooks? Maybe. Drawing a cock on your friends washing label with the message 'nice tits' knowing she would see it is not normal. It doesn't mean he won't grow up and grow out of it but yes, it needs nipping in the bud.