The time kids start to learn about sex, and finally learn that kissing isnt the highest level of love. They used to say someone and someone sitting in a tree, k.i.s.s.i.n.g, in 4th grade they would say someone and someone sitting in a tree, f.u.c.k.i.n.g. Right now they laugh at sex and think its gross but 2 years later they'll want to have sex but then laugh at masturbating and think its gross, then 2 years after that they'll like both.
Eminem: Of course they'll know what intercourse is by the time they hit 4th grade they got the discovery channel dont they?
