Can the genes or their epigenetic switches be modified in such a way that a person's sexual orientation changes, and the change becomes inheritable? Hypothetically, if a genetically exclusively heterosexual male performs sexual activity with another male in the absence of a female partner to obtain sexual pleasure, can the genes/ epigenetic switches of the first male be modified in such a way that (A) He will be sexually attracted predominantly towards other men from then on, and (B) If he mates with a female in future and produce an offspring male, the male child will be genetically predominantly homosexual? By "an exclusively heterosexual male", I meant the kind of male who's sexually attracted exclusively towards female and wouldn't engage in sex with a male if there is no adverse condition/ restriction on him. ( For example, a lot of homosexual men in Asia have to marry women due to social pressures. ) Also, I know we don't know yet if somebody's sexuality is purely genetic, but that's why I said hypothetically. I want to understand if life events could influence genetics if sexuality was purely genetic. In other words, can purely genetic traits be altered by life events? Thank you for your attention.