DAD. Now. The adult male body. In a few years time it's something you'll find yourself attracted to. And the focus of that attraction is—the penis. MUM. When you are in a relationship… DAD. Right. MUM. Stable loving partnership… DAD. En. During the act of love-making, the penis will stiffen and grow considerably in size. DAUGHTER. To what sort of dimensions? DAD. When erect, anything between three and four and a half inches. The penis will rise to an angle of between 90 and 155 degrees. The man then inserts the penis into the woman's vagina, and leaves a deposit of sperm. The man then withdraws his penis, and that concludes the act of sex.