[NSFW] Can someone explain lust to me?

I am asexual. Always have been. That means I have no sexual attraction to either men or women. When I was 14 I went to my doctor and asked him if there was something wrong with me, since everyone else in school was talking about sex non-stop and I had to fake interest just to seem normal. He sent me to an endocrinologist who felt up my balls, did some blood tests, and pronounced me physically fine. My doctor just shrugged and said, “Some people bloom later than others.”

I never did end up blooming.

Oh, I’ve tried sex. The machinery works just fine. It was disgusting and thoroughly unpleasant. I’ve been happily celibate for the last couple of decades, and plan to spend the rest of my life this way.

Here is my question: Can anyone explain to me what lust feels like?

Standing on the outside looking in, I am utterly baffled by what could possibly attract people to activity which is, when experienced without sexual desire, quite repulsive. As part of a tiny minority (a study in 2004 in the UK suggests about 1% of the population may be asexual), I often find myself both exasperated and perplexed by the never-ending obsession everyone else on Earth seems to have with what seems to me to be an activity with very limited permutations.

Don’t you get bored? I mean, okay, I suppose I can intellectually understand an irrational compulsion. I get hooked on a video game sometimes, and will play it non-stop for months, even years. Yet eventually I grow tired of it and move on. And a video game has a hell of a lot more possibilities than sex does.

Why? Can you explain to me what it feels like to have a bizarre compulsion to play in someone else’s body fluids?