Deceitful Appearances

Screwball-comedy plot with most of the comedy scrubbed away: a millionaire is dying, and his niece and her boyfriend hire an actor to impersonate his long-lost son. The mechanics of the plot aren't really important (and I'm eager to avoid possible spoilers), but the new household that the actor-guy assimilates into is full of different flavors of sexual non-comformity, all of which he gradually becomes comfortable with -- gay men, lesbians and a trans/intersexed woman whose state of being is what set the whole plot in motion.

Filmed in 1977, but not released until 1983, probably because of the scene where Gonzalo Vega gets his ass plowed by... ah, but that would be telling. It'd be fair to say, though, that this is a more radically inclusive piece of work than El Lugar Sin Limites (also 1977) , which has been canonized as THE first queer-positive movie from the Mexican industry.

Trailer...