Fartacus: Only someone like Wonder Woman has a strong enough uterus to carry Superman's kid. The only way he could bang regular chicks is with a kryptonite condom, which would kill him.
Anonymous2: There is no way he could fuck Lois hard enough in order to get himself off, he would just end up pulverizing the bones in her pelvis. Wonder Woman is the only viable mate for him.
"Yeah?"
"Wanna see a trick?"
"Shoot"
"Exactly"
"WEEEEEEEEEEEE"