Is Being Gay Hereditary/Genetic?

[SmileyEH]

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All gay persons parents, grandparents and their entire ancestral lineage engaged in heterosexual sex. How could being gay be a genetic trait?

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I'm pretty sure plenty of homosexuals have engaged in heterosexual sex.

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Andy: Hold on, his daughter? But he's definitely gay.

Maggie: He can't be gay if he's got a daughter.

Andy: Oscar Wilde was married with two kids.

Maggie: Well he can't have been gay.

Andy: What Oscar Wilde?

Maggie: Yeah.

Andy: Got to stop hanging around with you.

-SmileyEH