Yes, I have one gay couple where one of them was abducted and impregnated. The little alien is the guy's biological kid. But otherwise all my gay couple either adopt or foster. In Sims 3 I did have one lesbian couple where one half of the couple got pregnated by their close male friend on purpose (their story was that the girls approached their friend and asked him if he wanted to give them his sperm).
I am aware of the feature that enables Sims to impregnate their same-gender other half but I prefer not to use it because for me its not realistic enough and yes, I realise that I am talking about a world where aliens roam and vampires break in to suck your blood. Maybe in one of my saves I will have gay couple with biological children.
