Thing is, it's not really about being owed sex, at least intrinsically anyway. I suppose I could make the argument that if you are a productive member of society, then on some level you should be owed a partner. After all, who would support a civilization in which they can't even acquire a mate?
Either way, he claims that he will probably have sex one day, and that may very well be true. However I really have to wonder, how is it reasonable for him to go more than a decade with unsatisfied physical and psychological needs? Not only that, but if he does eventually end up getting a foid, statistically she'd be very likely to leave him, and the older he gets the harder and less likely it will be for him to find one who doesn't already have children. Meaning he'd be raising the children of another man while possibly not being able to have any of his own.
IT likes to talk about how our views are "extreme", but the reality is, you'd be hard pressed to find another period in post-agriculture human history where there would be anyone who sees the situation our mentioned IT user is in as even remotely reasonable.