When you say "no interest", do you mean you're asexual? I feel a little like I'm prying here, but there's so many different reasons people are saying they're not having sex in this topic so it's interesting to see the categories people might fall within.
● There's asexual folk, who may feel a bit of pressure from society to have sex because it seems "normal". But who will never actually be happy having sex, because they don't work that way. It's not particularly appealing for them, sometimes it's even a straight turn off altogether. There's no way to 'fix' this, because these people aren't broken. They are simply born as unique and amazing individuals with different physical/emotional needs than others have.
● There's folk who think they're ugly and have given up all hope they'll find someone in their range to be intimate with. This can be a self perpetuating cycle wherein the amount of rejection leads to an individual failing to take car of themselves (hygiene, grooming, etc) and of course that itself turns people off. This can potentially be fixed by being more realistic about your options (yes, being willing to 'settle' in terms of looks. But to me, connecting on an intellectual level is more important anyway) and taking better care of oneself.
● There's folk whose self-confidence/self-esteem is so shot that they see no light at the end of the tunnel. They cannot see a way to get over the mental blocks they put in place about dating. These people defeat themselves before they even leave the house. I can relate most to this ground, because I have this sort of mental block for other things in my life and it has taken me the better part of a decade to fight most of it into near submission. And it's still a daily battle to keep it that way. This one maybe can be fixed similarly to the next entry, by lots of practice or therapy.
● There's others who have different disabilities, like emotional or social disabilities which prevent them from connecting with others or give them crippling anxiety when they attempt to "play the field." This one can perhaps be overcome with proper therapy and guidance and medication, depending on what the issue is.
● Others yet who simply abstain due to religious reasons, and feel sex is only worth having in a relationship where they deeply care about the individual. This is a conscious choice and people who are virgins in this state are generally facing a different sort of inner turmoil, mostly based around how much temptation there is
What do you think? Am I wrong with my analysis here, more categories, or simply need my theory modified a bit?