In Sims 3, if you ma gay Sims, they pretty much always stayed gay - even if you stopped playg them for a while.
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SIMS 4 MA MY GAY SIMS STRAIGHT
I do not have the full story mted to memory, but some batn of nfn (sign document nsistenci, or g an old sign document) and the sexualy of the guy charge of the thgs (he was gay) is the only reason this happened the first place.