"...studies have found that mothers and maternal aunts of gay men tend to have significantly more offspring than the maternal relatives of straight men......but what makes these women so fecund, you ask?
The theory holds that the same genetic factors that induce gayness in males also promote fecundity (high reproductive success) in those males' female maternal relatives... Through this trade-off, the maternal relatives' 'gay man genes' (which aren't expressed as gayness in women), tend to get passed to future generations in spite of their tendency to make their male inheritors gay. If a daughter inherits that same X-linked gene, she herself may not be gay, but she can pass it on to her sons."
"Previously, the Italian researchers suggested that the 'gay man gene' might simply increase androphilia, or attraction to men, thereby making the males who possess the gene homosexual and the females who possess it more promiscuous. But after investigating the characteristics of 161 female maternal relatives of homosexual and heterosexual men, the researchers have adjusted their hypothesis. Rather than making women more attracted to men, the 'gay man gene' appears to make these women more attractive to men.The idea that there's a more physically direct, genetic, gay-related characteristic that is explicitly selected at the time of mating is pretty intriguing.”
"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. 'In other words, compared to the others, [they are] perfect for a male,' Camperio Ciani said. Attracting and choosing from the best males enables these women to produce more offspring, he noted."