Would you sleep with your friend's girlfriend or wife?

I do not sleep with other women.

Not if I actually liked him. 

Not while they were still together. That would be a betrayal. My long time friend and his wife decided to call it quits and he moved off to WYO, and she moved to SF. I spent a long weekend with her in SF where screwed each other silly for days. It was a lot of fun. If she had been as nice and sweet to him, they may not have gotten divorced. 

does knob count?

Im not that way inclined.....boyfriend /husband .....er ...no dont think so

Some men are attracted to "taken" women.