Tried to test it myself, made a few lesbian Sims and had them WooHoo and I can't seem to recreate your issue.
I'm unsure what you mean by "I also have the ww pregnancy box checked off."
Which setting are you referring to exactly?
The override game/mod pregnancy box.
Tested it with both the setting on and off, still can't seem to be able to recreate it.
If you turn that setting off though WoW stops having anything to do with pregnancy, and it's all controlled by MCCC or any other mod you might have installed.
