The father of a 12-year-old boy is questioning why his son has been taught "all the grubby stuff" about sex, but none of the basics, such as how a baby is made.
The man, who is in his 40s, took his son out of sex education classes last week because of how explicit they had been.
The boy's class had discussed things they could do besides intercourse, and the teacher had suggested oral sex as it "wasn't sex" and "won't inevitably lead to sexual intercourse".
Anal sex was discussed as another option.
Students also lay on the floor together with their eyes shut imagining the world was predominantly gay.