There's probably something off about him if he's never been on a date but if he's just a normal and kind person I wouldn't think anything negative of him. Virgins are absolutely the most ideal. I would much rather someone who has never been with anyone else or has at the most 2 people he's slept with. Anything else is just repulsive and would break my heart.
I would think they are asexual but if they wanted to date but couldn't because every girl they meet doesn't want them, then I would assume that they are generally considered unattractive, they are shy, they have horrible personalities or they are socially awkward.