Two guys and one girl, all three of them are equally sexually attracted to each other. Why is this such a common female fantasy? Probably for the same reason MFF is so common of a male fantasy?

I knew a guy who was so into MFF that he made it his lifestyle. In his case it was because he was a sex addict, and he wanted to go and go and go way longer than your average woman, so he figured, why not have two? They can get each other worked up and then when one is too worn out he's got the other. He liked the idea of the girls being into each other, but he didn't need them to be in love. Just "bicurious play" was enough for him.

For women who are into MMF I think there are some parallels and some vast differences. I think that women are more prone to emotion-addiction than sex addiction. Much like the guy who wants to be able to go back and forth between his girls when one is too tired for sex, I think women like the fantasy of having two men who care about them, especially in pregnancy fantasies--two daddies who love your baby(ies)--so that even if one is busy you've always got the other to turn to.

Most women who read erotica are married with children, or divorced with children. So we know the mundane truth of what it really means to try to co-parent, and the fact that, as the mother, you're probably doing most of it. The idea of two guys who are into you, paying attention to your needs, your child's needs, etc., is really hot.

Now, a lot of MMF fantasies don't involve children, at least not until the very end when HEA + baby is the epilogue... But the same desire to have not only one, but two men, emotionally invested in you, caring about you and your problems, helping you through life, is so enticing. Because in real life you have your man, and he's got to work, or hang out with his friends, or sleep, or play his after-work video games, or whatever, and sometimes you really just want to talk, you want it to occur to him to put on music and crack a bottle of wine and ask you to dance, just for the sake of dancing. You want him rub your feet without being asked. You want him to realize that the dishes do not do themselves and perhaps he could actually help with them... You know he needs time to himself, you know it's good he's working, you know sleep is totally reasonable... But you still feel kind of lonely and you have to repress your own feelings to prioritize his. You probably have girlfriends... But wouldn't it be nice to have another hot husband/boyfriend to turn to, who will kiss you like crazy, and then go knock otherwise "busy" husband/boyfriend into better sense and drag him back into bed too? For that matter, men don't always last as long in bed as we need them too... Two men, can help a lot with that problem.

SO...I suppose my conclusion is, yeah, MMF and MFF as fantasies are not so dissimilar in many respects. However, it does seem women are far more interested in the emotional relationship between the men than men are in an emotional relationship being present between the females. Why? Women are more emotional? Yeah. But I think it's also about loyalty. Women do want the HEA. They want their men to stay and be devoted to them, so they in turn can feel safe pouring their devotion back. HEA cannot happen in an MMF unless the men are in love too.

MFF can work long term, even if emotionally it's FMF as long as each women has her own reasons for being in the relationship and playing nice with the other woman (thus the success of polygamy in many cultures). Now, if the guy wants the girls to be into each other too, that's has the potential for a bit (or a ton) of drama... In fact, your probably going to get more what you want as a guy if you're fine with mere "bicurious play" rather than deeply invested emotional relationships. Based on the guy I know who picked this as his life style, he had to get each of his women their own house, car, etc., all equal, and then they all had a central house that they hung out in when they wanted to (yes he was wealthy). When the girls got involved emotionally, drama drama drama and it was kind of miserable for him. It suited his needs more to have women who weren't romantically emotional with each other but merely into "bicurious play".

In MMF fantasies the men are bonded, lovers like brothers. They are loyal to each other as well as to their woman. This is an essential part of the fantasy. As an MMF reader, I'm turned off by the idea that they guys aren't into each other and they're just tolerating each other for the woman (now if it begins that way and ends with them into each other that is different).

Why is the emotional bonding between the men such a big part of the fantasy? Men who are loyal to each other and to the same women will fight together to protect their threesome and whatever family it produces. This creates a great security for the woman, which, let's face it ladies, our primal biological programs really want, because we are programmed to want babies and we definitely want those babies to be protected--two big muscly fiercely loyal protectors are better than one. So, the female mind, driven by the end goal of nesting (no matter what our intellectual educated first-world minds might like to believe), wants emotionally invested loyal protectors. The male mind, driven by the end goal of sticking his semen in as many potential wombs as possible (whatever his first-world "I don't want the responsibility of children" mind might say), wants as many willing baby incubators as possible who will peacefully coexist with each other so he's always got someone to knock-up. Like a gorilla.

Not an insult to men, or to women, just a basic iteration of the primal programing running underneath all the things our fancy frontal cortexes have to say, and how that programing plays into modern sexual fantasies.