Well, for one thing, it’s not clear that DID actually exists.

But, for the sake of argument, say it does. I think the most reasonable-sounding approach is to say the identity in control at the time has something like usufruct ownership of the body - they can use it, but not damage it, so they better be having safe sex.

The second situation is pretty straightforwardly rape by deception, depending on how exactly it unfolds.

I guess slightly related, I’ve always wondered how conjoined twins manage these sorts of compromises. I’m sure it’s possible for one conjoined twin to violate the other’s bodily autonomy by engaging in sexual relationships with other people without their consent (like maybe while they were asleep or weren’t able to control their body) right?

I have no idea how sex specifically works, but I know of one pair that at least dates. They say they’re really good at ignoring the other and just reading a book. In a lot of ways, it’s not too different from more mundane situations where people are forced into uncomfortably close quarters - like in a shared prison cell.

Yes, I know systems who have had alters sexually abuse other alters in the same body. It’s a sadly quite common thing actually, most likely because of how persecutors form.

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