Gay sexual practices are sexual activities involving men who have sex with men MSM , regardless of their sexual orientation or sexual identity. Evidence shows that sex between men is significantly underreported in surveys due to social desirability bias. Various sex positions may be performed during sexual activity between men. Historically, anal sex has been popularly associated with male homosexuality and MSM.
WATCH: Dave Franco Is Hung Like A H-O-R-S-E / Queerty
While female sexuality appears to be more fluid, research suggests that male gayness is an inborn, unalterable, strongly genetically influenced trait. But considering that the trait discourages the type of sex that leads to procreation — that is, sex with women — and would therefore seem to thwart its own chances of being genetically passed on to the next generation, why are there gay men at all? This longstanding question is finally being answered by new and ongoing research. For several years, studies led by Andrea Camperio Ciani at the University of Padova in Italy and others have found that mothers and maternal aunts of gay men tend to have significantly more offspring than the maternal relatives of straight men. The results show strong support for the "balancing selection hypothesis," which is fast becoming the accepted theory of the genetic basis of male homosexuality. 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.
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