Why aren't CIS women allowed to donate sperm?

But trans men are men. So can trans men donate sperm?
When we say "can", are we talking about legally? Or about in practice?

I don't know if there's any laws (or even just industry policies and regulations) against ciswomen donating sperm, or permitting transmen to donate sperm.

It's an interesting dilemma, though, and probably a good social experiment/ performance art piece. I'd encourage anyone here who is a ciswoman and/or transman, to pop down to the local sperm donor's office and see what happens. Film the result.
 
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