Shadowix
I would be really surprised if he never slept with Bellatrix Lestrange.
Also, there is nothing sirius about this question...it's a kids' book. No one cares who Voldemort had sex with, and if they do it's DEFINITELY not a matter of life and death here.
I know that it is in the children's genre, but if the audience were limitted to kids, j.k. rowling wouldn't have any more money than stephanie meyer. (j.k. rowling was richer than the queen of england in 2005. since then she's pulbished two more books and gotten royalies for four more movies)
no-one said it was a question of life and death, but you can take it seriously all the same.
first, voldemort didn't strike me as the kind that had much sexual drive, but now that you mention it, I could deffinitely see belatrix jumping when voldemort said jump. but voldemort saw himself as miles above everyone else and probably wouldn't think twice about bellatrix in that way. I think he was too unloved when he died, meaning, yes, I think he was a virgin.