I suppose the outcome depends on the specifics of the case.
Is there a precedent? I mean, aside from a Shel Silverstein poem, I've never heard of such a case.
Well, unless you want to count The X-Files episode "Humbug", which involves a conjoined twin who can detach himself at will for short periods in order to kill people. But, no, I don't think that one counts.
Is there a precedent to start with? Or would you prefer that I simply account for all the potential permutations of such a case, so that you can do the hard lifting of complaining that none of the answers are sufficient, and I can do the easy work of providing more and more answers?
There may be no precedent. I think that is why he asks. It is certainly why I ask. What precedent do you feel should be set? Sure we are talking hypotheticals here but what IF a pair of conjoined twins, where one is parasitic turns 18 and the host twin decides she wants a normal sex life and can't have one. She feels her right to her own body is being violated. Perhaps her parasitic twin is in love with a guy who the host twin hates. The parasitic twin and the guy get married. In order for her husband to be able to be intimate with his wife, even if he is respectful to only touch the parts that belong to his own wife, the host twin still will be forced to participate in certain acts even if it is only by being present. What if they share a vagina? Sex with the husband would put the non married twin in a state of rape. What does one do? It's my guess that most twins simply compromise, but how? And what if they can't? How can a court take a side in the case without inflicting a terrible injustice on the one that lost?
This is the point that I believe he is trying to make. What precedent would you set? And what legal justifications would you give for said precedent? Keeping in mind that whatever legal declarations you make in this case can and most certainly will be taken out of context by a fanatical lawyer and interpreted in anyway she possibly can in order to make her case and possibly push a political agenda in doing so.