I've only had one FFM, but it wasn't even a real one, because it was at a strip club and a lap dance with two--I assume--lesbian strippers. But it half counts because they were full-on eating each other out and fingerfucking each other like crazy, to orgasms, multiple orgasms, even 69ing, while both laying on top of fully clothed me. But it was a lot less fun than you'd think: they just pretty much ignored me, and just went to town on each other. There was the odd knee or wrist on my cock as body leverage, as opposed to purposeful stimulation, like other lap dances I've had. I wish it had happened a few years later when this strip club allowed full on sex with customers, even out in the open, and maybe they would have taken turns between sucking my cock and licking each other's pussies (my best buddy had his cock sucked and fucked countless times there during those years before the police put a stop to it, but by then I was only into guys). I've never had an MFM, but would have loved MMF. But that never happened. But I've been in many multi-men situations in gay bathhouse saunas and large gay orgies (along with countless one-on-one encounters at them). But I've only been in a couple real MMM threesomes, with this one gay married couple I know and are close friends with. The first time was when a bunch of us platonic friends in this gay social meetup group went to a local nudist camp for a day visit. We all settled into a large, isolated, hidden grove in the woods to sunbathe and chat. But near the end of our visit couples started sucking and fucking. But I was the single guy out, and didn't want to mess around with any married people. But my closest gay friends in the world, married to each other, seduced me, and I ended up lying back in the lap of one, with his hard cock rubbing my back, while he was playing with my nipples, while his husband was sucking my cock. A couple of months later, this past July, I ended up in a full-on threesome with them, after everyone had left the backyard birthday party barbecue. They again seduced me (I keep saying that because I was reluctant), and stripped all my clothes off, with one of them enveloping my cock in his mouth. After that I couldn't resist, and we enjoyed the next couple of hours or more sucking and fucking, with the one husband and I taking turns spitroasting the bottom man in the marriage from either end, one cock in mouth and one cock in ass, back-and-forth.