So, in this situation, I have a boyfriend and a girlfriend, but I don’t have a girlfriend, but would I have sex with her if she wanted it anyway? I feel like I don’t understand what you’re trying to say. Did you mean “would I let a single friend have sex with me and my partner?”

Yes, and have done so. Though not with my current partner.

My fiancée and I are monogamous, so it’s a simple “no”

Are you asking this of bi guys or hetero couples? I have third-ed for male couples before, that’s fun, and my husband is not jealous so has done MFM with me, I don’t know any women who can’t get sex when they want it, so if that’s what you are asking, no it’s never come up.

I’ve had this. It was awesome for a short time. I was dating a guy and a fellow transfem. The guy and I were quite close and we dated as a group as much as I could convince them before the whole thing fell apart. The guy was the only real top among us, so he’d fuck me and her. We did a lot of other things. I ate a lot of cum. Honestly though, these memories are fresh enough that I look on them with longing rather than nostalgia.

Would it matter if your boyfriend finished in her instead of you?