![]() Sexuality cannot be pinned down by biology, psychology or life experiences, this study and others show, because human sexual attraction is decided by all these factors. In its stead, the report finds that human DNA cannot predict who is gay or heterosexual. The study of nearly a half million people closes the door on the debate around the existence of a so-called “gay gene.” That’s the first thing you need to know about the largest genetic investigation of sexuality ever, which was published Thursday in Science. There is no single gene responsible for a person being gay or a lesbian.
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