Say that to some gay rights activists and they will get VERY upset (usually those that defend that gays are born gay, and thus this is why gays must have several rights, and why the religions should not consider it wrong).
I had a particularly heated discussion once, with a hetero woman that was sympathizer of gay rights, she was VERY convinced that sexual orientation was fixed, she told me that there is no such thing as "ex-gay", and all "ex-gay" are just closeted homosexuals and will become gay again given enough time.
I gave her some articles about ex-gays complaining about receiving MORE flak after becoming ex-gay than when they were gays (including there is a existance of... closeted hetero, people that were gay, and do not assume to be hetero because both hetero and homosexuals then attack them, assuming he is still a sort of traitor gay), this still did not convinced her.
Then I showed a discourse by Luiz Mott (leading gay rights activist in Brazil), where he claims that he was hetero, and now is gay by his own choice, and that he was NOT born gay.
This STILL did not convinced her, she told me that Luiz Mott was a liar, but only in that case (and that everything else he says is true).
Sometimes people disappoint me.