I'm of two minds. As far as a romantic relationship, trust and honesty are key. You shouldn't be in a relationship if you can't be honest.
OTOH, if we're talking purely physical encounters without emotional connection, then I find it hard to get upset. People lie to each other constantly in these situations. "What do you mean you're not really a Nobel Peace Prize winning astronaut?!!!". Make-up, Spanx and push up bras earn billions of misrepresenting physical attributes. Bars and clubs are poorly lit for a reason. I find it hard to get upset if someone finds out after the fact they took a transgender person home. As long as you are not actively endangering the other person through illness or similar, then in my mind it's no worse than what happens every day in those situations.
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