I'm sorry, but unless you're stranded alone on a desert island, there's no way to actually be 'involuntarily celibate'. Unless one literally has no money at all, it remains a shameful and unfortunate fact that a relatively small amount of money can obtain the services of what Sir Terry Pratchett would call a Lady of Negotiable Affection.
This leads me to think that there is more involved here than mere sex. There is an assumption, for instance, that men have a 'right' to (unpaid for) sex. Not true -reaching that point in a relationship requires some active input. There is clearly a failure to deal, on a day-to-day basis, with women in a non-hormonal way - every encounter must be about sex.
In short, we are suffering the fall-out of an over-sexualised society. Since the 1960s, there has been an ever-increasing emphasis on sex as a vital part of life. If one looks back before, one can see that the preceding era, from the late 18th Century onwards, was one in which confirmed bachelors and spinsters held an accepted, and often useful, role in society. Nobody who read Conan Doyle at the time he was actually writing was perturbed at the bachelor status of Sherlock Holmes, or his immunity to what Dr Watson calls 'the tender emotion'. It was only in later decades that commentators and writers took issue with that aspect of the character in both criticism and fiction.
Sex, getting it, having it, enjoying it, has become such a massive issue in modern society that it is now seen as a basic necessity for a fulfilled life. So people who aren't getting any feel deprived. If you add emotional immaturity, laziness, impatience or a simple lack of guts and determination into the equation, you have the makings of an 'incel'. Society created these monsters, but people have to deal with them!