As you can see in this table, fantasies about socially or culturally forbidden persons are far more common among men than they are among women, regardless of sexual orientation. Indeed, it’s striking just how similar heterosexual and non-heterosexual persons’ responses were.

Among men, about three-quarters had fantasized about sex with someone who is married, more than half had fantasized about their partner’s best friend, nearly half had fantasized about their best friend’s partner, and more than a third had fantasized about their partner’s sibling.

The numbers for women—and especially heterosexually identified women—were much, much lower. In fact, for straight women, less than half reported having any of these fantasies.

I included results for persons who identified outside the gender binary (these folks represented about 5% of the sample). Their responses were in between those of self-identified women and men, but tended to be a bit closer to women’s responses on average.

So how do we explain this pattern of results? It may have something to do with a finding I discuss in Tell Me What You Want, which is that men have more taboo sex fantasies in general than women. For some reason, men are just more turned on by the idea of doing things they’ve been told they can’t or shouldn’t do. This may stem—in part—from the fact that men tend to be higher in sensation-seeking tendencies, so perhaps they’re more drawn to taboos because it provides an extra thrill.

Alternatively, this may also have something to do with the fact that women are more likely than men to fantasize about passion, intimacy, and romance. Those emotions may be a bit more difficult to envision with forbidden targets, so perhaps that’s why women’s fantasies are even more likely to focus on their current partner compared to men.

Of course, other explanations are possible, too, and we need more research if we really want to understand what’s going on here. In the meantime, what these findings tell us is that forbidden fruit fantasies certainly aren’t rare—and, at least among men, they’re actually pretty common.

With all of that said, it’s important to note that having these fantasies doesn’t necessarily mean that people want or plan to act on them, or that they’re necessarily a sign of relationship dissatisfaction. Not all sexual fantasies are sexual desires. It’s also just human nature to be turned on by sexual novelty, such as by fantasizing about new partners and/or activities.

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