A common hypothesis, which the Dish has covered before, is that "a gene predisposing a man to be gay might make a woman even more attracted to men than she otherwise would be, so that she would engage in more heterosexual sex and thus become pregnant more often." New research adds a wrinkle to the theory:
Rather than making women more attracted to men, the "gay man gene" appears to make these women more attractive to men. … Turns out, the moms and aunts of gay men have an advantage over the moms and aunts of straight men for several reasons: They are more fertile, displaying fewer gynecological disorders or complications during pregnancy; they are more extroverted, as well as funnier, happier and more relaxed; and they have fewer family problems and social anxieties.
The Dish 