Well I had an mmf threesome and it was great. It was me (male) and mate we will call P and a married woman we will call E.
I had just come out of a pretty serious relationship and kept the house, P moved into my spare room to help cover the rent. P had been sleeping with E for about a year with her cheating on her husband. He asked if I minded him bringing her back after a night out as he'd only just moved in, which I didn't. Get back to my house P goes upstairs and I go into the kitchen to clean my bong, when I turn around to find E on her knees behind me, with our saying a word she unzips me and starts sucking my dick for a while then grabs my hand and takes me to my couch where she carries on. P returns from upstairs and says "oh I thought you would have waited for me". So turns out they had planned this to cheer me up. So he joins us and sits next to me then leans towards me with his dick and we are now both in Es mouth at the same time. As the session progresses we are dping her, a hole each, then in both holes together. He came in her ass whilst we were both in there which was awesome. I sat back on the couch again so E could suck me off again as she wanted to taste some cum. I get told to close my eyes, now this is the only bi experience I have ever had but they now suck my cock together and lick my balls and asshole, doesn't take me long to cum and P alternates my aim between his face and Es. They kiss sharing my load between them, then climb up onto the sofa with me and the three of us lay there chilling with them both gently fondling my cock and balls. Turns out P has always been bi and just wanted a cock to play with......I didn't mind. When E left P came to my room and asked if he could suck my cock again. I did let him and I did cum but it didn't feel as good without a female participant, but I'll never forget that night and it still gets me hard while I'm typing this out