Straight up answer: block his line of sight. Fence, wall, tree, whatever you can think of.
More funny answer: give him something to talk about - every night do a little skit (film it yourself as protection for later) where in the camera’s sight you act out something like pre-murder but you make sure the actual fake murder is out of his view. Come out with ketchup all over your clothing and bury the clothing in the yard.
Act out some pre-sex but take all actual nudity off camera. Fake gay sex good too, have someone wear a UPS costume get flirty on camera (have him drop all his packages and run toward you) then go inside and turn out the bedroom light.
That’s brilliant! We can definitely give that a try. If it’s bad enough, they might move! Of course, what weirdo would we get next?