Sperm Donor Preferences Mirror Ordinary Mate Preferences

Chris Williamson frames sperm-donor preference as a useful split test: ordinary mating choices combine at least two motivations that are hard to separate. A person choosing a partner is not only selecting traits they may want in their children; they are also responding to the traits that make them want to have sex with that person in the first place. Courtship, seduction, attraction, and the social risks of interaction all sit between stated preference and reproductive outcome.

Sperm donation removes much of that intervening machinery. Williamson’s point is that if a woman is choosing a donor rather than a sexual partner, the question becomes more directly about what traits she wants a child to inherit. The donor does not need to be charming in person, socially dominant in a room, or capable of creating attraction through interaction. The decision can be reduced, at least more than in ordinary dating, to “what do I want my kids to be like?”

Steve Stewart-Williams agrees that the separation is revealing, but emphasizes a result Williamson finds paradoxical: the same mate preferences appear in the donor context as in real social interaction. Even when the seduction and courtship side is stripped away, Stewart-Williams says, the familiar preferences do not disappear. The stated ideal donor looks like an abstraction from the same preference system operating in actual mating contexts, rather than a completely different list generated only by parental planning.

That is the oddity at the center of the exchange. Sperm donation should, in theory, be where attraction and reproduction can be pulled apart. Yet Stewart-Williams says the same preferences re-emerge. Williamson treats that as evidence that donor choice exposes the genetic side of preferences more cleanly, while still echoing ordinary attraction.

To sharpen the contrast between reproductive preference and sexual willingness, Williamson brings up the Clark-Hatfield study, which Stewart-Williams summarizes as a campus field experiment. Attractive men and women approached strangers on campus and said they had noticed them around, found them attractive, and wanted to ask one of three questions: would they go out with them that night, come up to their room, or go to bed with them.

For the date request, Stewart-Williams says the first study found essentially no sex difference: roughly a 50-50 likelihood of saying yes for both men and women. He adds that other replications found the difference was not large, though men were somewhat more likely to accept than women.

The larger divergence appeared when the request moved away from a date and toward immediate sexual access. For the room invitation, Stewart-Williams says about 67% of men said yes in the first study, while only about 6% of women did. Williamson notes the comic implication: men were more likely to agree to go to a stranger’s room than to go on a date with her.

For the direct request to go to bed, Stewart-Williams says 75% of men accepted. Among women, acceptance was 0%.

The manner of refusal mattered too. Stewart-Williams says the men who declined were often polite, apologetic, and sometimes asked for a rain check. They might say they were busy or meeting a fiancée but suggest postponing the sex. Women’s refusals, by contrast, were not apologetic in his telling. They reacted more as if the question itself were offensive or alarming: “Are you crazy?” and “How dare you ask me that.”

Williamson asks why the refusals differed so sharply. Stewart-Williams gives two explanations. The first is an average sex difference in interest in casual sex. If men are more interested in casual sex, they are more likely to experience the proposition as flattering rather than intrusive. He also notes the asymmetry in approach: men traditionally approach women more often than women approach men, so women are more likely to get tired of being approached and more practiced at pushing men away. For men, the reverse approach is rarer and therefore more likely to be received as a compliment.

The second explanation is physical risk. Stewart-Williams says that if a woman goes off with a man she does not know, she faces greater physical danger than a man going off with an unknown woman. Williamson restates the point as an emotional activation: “hang on, I’m gonna go with this person who I don’t know who is physically stronger than me.” Stewart-Williams agrees. The threat environment is different, so the same verbal proposition does not carry the same practical meaning.

That distinction matters because it keeps the study from being read as a single-variable measure of libido. Stewart-Williams is not saying the result is only about male eagerness for casual sex or female disinterest. The size of the gap, in his account, reflects both preference and risk. A woman saying no to a stranger’s sexual invitation may be rejecting the sex, the stranger, the danger, or the presumption contained in the request.

Williamson adds another wrinkle: the perceived mate-value mismatch between the person approaching and the person being approached. He suggests that one reason women may respond rudely to some male approaches is that the approach itself can feel insulting if the woman perceives a large disparity in desirability.

His example is blunt. If a woman thinks of herself as an “eight” and a man she perceives as a “three” approaches, she may interpret the approach as a challenge to her own self-perception. The implied question becomes: “You think you’ve got a chance with me?” Or, as Stewart-Williams echoes it: “Do you not think I’m an eight as well?” Williamson’s point is not that people consciously assign numbers in this way, but that an unwanted approach can carry a status implication. It can feel less like a compliment than evidence that the world may not be rating one as highly as one rates oneself.

Stewart-Williams is unsure the reverse would work the same way. His hunch is that men would be less likely to experience it as a serious insult if a man who saw himself as highly desirable were approached by a woman he perceived as less desirable. Williamson agrees, tying the difference back to the earlier themes: men’s greater stated preference for casual sex and the relative rarity of women approaching men.

In Williamson’s view, many men would reinterpret the approach as proof of their own attractiveness: a woman overcame her usual non-approach tendency because he was compelling enough. He compares it to someone running unusually fast for a bus. The inference is not that the bus is low value; it is that the person must really want it because they are moving faster than usual.

Stewart-Williams adds a final generalization: men tend to be more overconfident than women. In this exchange, that overconfidence helps explain why the same cross-status approach might be assimilated as flattery by men and experienced as insult or threat by women.