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 Authorities enter people's homes for many reasons.
Relays have already been taken as evidence. Search and seizure laws are different in different countries and states.
Certain jurisdictions have draconian penalties for just nudity let alone sexual acrivity. The term Sex Worker is broad and covers many adult professions.  Certain kinks are major crimes in certain areas. 
The reasons are many. 
 You can have zap to see content, or subscription only content, or anything else that's relay- or client-based, but I don't see how you could avoid being identified and caught if the content itself is illegal in the jurisdiction where you operate.

I'm not trying to be a black cloud, just trying to break the problem down to manageable solvable specific issues because it's not clear to me that we have a full picture of the needs, or that all of the needs can actually be solved at all. 
 One thing I do say all the time is that relays should be absolutely dumb, to the point that in my opinion content should be by default ephemeral: if a user wants to store stuff, they should do it using their own hardware.