Asked My Wife

Last night me and my wife were messing around a little, nothing big, little oral. I brought up how one of my friends had confessed to me and another friend he never tried anal, with his ex wife or his current wife. I brought up, if she would even consider letting him put it in her ass, as she likes a cock in her ass. She was like "him? uhh no" and I was curious and asked why and she said that she would probably get pregnant knowing him (he has 5 kids, two with his ex wife and three with his current wife) and I was like how can you get pregnant from your ass. She said no way she would let a friend bang her ass, going around to like kids parties with our kids and their kids knowing he had fucked and creamed her ass with his wife right there. Which makes sense but she also said she wouldn't want any friend to do it really. Even a threesome seems out of the question so I guess thats stuff I need to give up on cause I have no idea how to go forward with this.