Gay sex can produce offspring – in beetles: “When housed together in laboratory containers, male beetles often mount one another and copulate, even transferring sperm on some occasions. Males are unlikely to be merely mistaking their male mates for females, since they are known to make the more subtle discrimination between virgin and mated females… Male-male matings may offer an unexpected, though subtle, benefit. Some of the sperm transferred in such encounters may later be ‘accidentally’ passed along when the recipient male later mates with a female, the researchers found.” [New Scientist]