Teacher Ken is trying to talk the girls through human biology but they seem fascinated with the male foreskin and the fact that some guys have them and some don't. They question Ken on the subject until he lets slip that he has a foreskin. This makes the girls desperate to see it and examine a foreskin up close. Eventually Ken gives in and the girls start prodding and poking his penis, pulling at the foreskin and giggling at it. They then want to see if it works like a normal penis and take turns to wank him off until he has a massive orgasm all over Victoria's desk and tartan skirt!