In the sense of it being a sex toy: no. I'd probably want a few more details, but the general answer would be no.
In the sense of "it seems human in every way": Are we talking actual AI? It would pretty much have to be full AI to be truly indistinguishable, and in that case, I would oppose the matter on the grounds of slavery. If it's a true AI, that includes sentience, and no sentient entity should be forced to serve as any form of slave, let alone a sex slave.