^ I did. Multiple times in fact. And a melodramatic like Voldemort would sire someone who would continue on his legacy, considering he tried recruiting Harry at some point. You say like having sex with someone would be considered precious to Voldemort. We're talking a Dark Lord who is known for wanting failsafes in place, just to keep his immortality going.
He was a charming character growing up, so it's hardly unlike he didnt have such needs, or sexual urges. Voldemort is still human at his core, and why would he not like having sex with people at some point? Having sex doesn't automatically mean they're in love, or such feelings are involved.
And what does a patronus have anything to do with it? Pretty sure most Death Eaters cant cast the spell, and pretty sure most of them have kids, or are you magically forgetting Draco Malfoy? Kids obviously can happen and just because one can't cast doesnt automatically remove the ability to reproduce.