Double your pleasure, double your fun; sex with two lovers is more fun than one!  The threesome is another very common sexual fantasy.  It’s often associated with the male erotic imagination, and it’s certainly one of the most widespread male fantasies, invoking images of double-wived patriarchs and the pleasures of the harem.  But women are catching up as it becomes more acceptable for us to admit we’d like to be with two hot men at once, or perhaps a man and another woman.
The male standard is sex with two women, of course–often a girlfriend and another lady.  This sort of ménage à trois fantasy is flattering to your erotic ego and gives you a sex-educational glimpse into the secrets of lesbian sex.  Of course, these are not man-hating lesbians; in fact, they love your penis!
More and more men now also confess that they fantasize about having a threesome with a woman and another man.  The level of imagined physical intimacy can run the gamut from barely touching the man while you both focus on the woman all the way to the two men having intense sex while the woman simply watches or “directs.”  You might also imagine watching the other man have his sexual way with your woman, with you as the “cuckold,” creating what I call the “sperm wars” effect, a competitive rise in your sperm count that arouses you even if you feel jealous and insecure.
Threesome fantasies can be so vivid, especially if one of the partners is your real-life lover, that many people try breathing life into them.  The resulting reality spans from having a beautiful experience which enhances your relationship, as well as your sense of your sexual self, to an awful, awkward incident that hurts everyone involved.  One thing is for certain: Everything in any fantasy is “perfect” as far as your libido is concerned.  Reality, however, is not quite so in tune with what turns you on, let alone what turns on your real-life partner or the third party.
A threesome can become an orgy, which is another common sexual fantasy.  One way to keep sexual monogamy from becoming monotony is to maintain an active fantasy life with as many different partners as you can imagine. I happen to have a personal soft spot for these. It gives the opportunity to experience real-life communal ecstasy.