I have done a MMF threesome before. Some couple asked me to join them. I'm ok with doing some stuff with guys if a women in involved. She did the double blow job(Both dicks in her mouth at the same time, plus rubbing them together), DVP, and me and her suck on his dick and him and her sucked mine when me and her were 69ing.
I wasn't crazy about it at the time, but now seems like I like those memories more than some of the women I was with.
Absofuckinglutely. There would be no bisexual touching. I'd have to be comfortable with the guy - think out of town visiting friend sort of thing. We would work together to please her.