I"ll try it this way. Is it possible to consent to sex without knowing the partners true gender? people do have surgery
If a trans person tells you they are female, but they do not tell you that they still have male sex organs, then it is deception, not sexual assault. You can consent to have sex with a person without knowing their real sex, but that consent disappears if either party says no or backs out.
Even if it would be a 100% NO if said partners original sex was revealed
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