Please stop using that word, no one but the person in question gets to decide if they are celebate or not, it's really disingenuous, and just indicates you don't understand the notion of consent.
For me several years passed between thinking 'I would like to lose my virginity' and said event happening. Should anybody feel sorry for me? No. But I can empathize with some of the feelings that lead people down that path.
At the same time sexual satisfaction is strongly correlated with happiness (or depression) and both genders experience very different phenomena here.
> ...we compared a sample (n = 151) of self-identified male incels...
That doesn't make sense, then it's voluntary.