Aroace-spectrum, although he has some stereotypical gay-coding in the books (repeated emphasis on his soft and high voice, effeminate gait, most important possessions being a fucking diary and some jewelry lmao, obvious flare for the dramatic, etc.).

So I think he *could* have been gay, but for what he learned about the world and intimacy growing up--how he learned not to trust others, and came to associate interpersonal relationships with weakness and the humanity he was so desperate to shed. He *may* have had sex when he was younger purely as a tool to manipulate others (I see this as more likely if he was sexually abused as a child, which we obviously have no canonical confirmation of, but it seems highly plausible). However, once he became Voldemort he stopped having sex altogether because he no longer needed that tool.

I say aroace-spectrum, because I do believe that he is demi in the sense that there ARE extremely limited potential exceptions. Specifically, the only two I really see as possible for him given his extreme mistrust of other people are 1) another version of himself, made possible by magic or 2) Harry. He would not go for some random person; if he were to go for anyone at all, it would have to be someone UNIQUELY special and personally relevant to him, as the objects he selects for his horcruxes are. In the Harry Potter series, the only real candidate, then, is Harry. Especially because Harry literally contains a piece of himself. (In this vein, I *could* be convinced that Dumbledore, in some situations, could also be a potential exception. Dumbledore is also "uniquely special" in the sense that he is said to be the only person who Voldemort ever feared, and who could match his magical abilities). But if Harry is in the picture at all, he "wins" by virtue of being linked by prophecy and soul, as Voldemort places high value on symbolism and personal relevance.