I'm pan-romantic and only recently realized I could be described as a gray-asexual. I very rarely experience sexual attraction and most of the time sex doesn't even enter my mind - no thoughts, dreams, fantasies. I'd rather not have it or at least not often, there are many more interesting things to do.
It doesn't have any kind of bonding quality to me, I prefer physical closeness without intercourse at all. Whenever I have it, it's a bit of a chore - I don't actively desire it, don't seek opportunities for it and I can't think of a time when I initiated it or behaved in a seductive way with the intention of having sex, so I'm definitely somewhere on the asexual spectrum in the gray area.
Unfortunately, I'm not aromantic, that would make my life easier when combined with my attitude to sex...
I do experience sexual tension (it just appears sometimes, unprovoked by thoughts or images) but then I want to simply get rid of it and I do it myself - bam, problem gone. The thought of just using another person to do it is pretty revolting to me... I can't understand people who go out partying, hoping they'll find someone willing and they'll get laid.
I experienced some nice sex, don't get me wrong and I kinda enjoyed it, but once it's done, it's done and I don't go back to memories of it, don't want to do it again anytime soon.
I also think (many people would not agree at all) that world without that much sex would be a better place, I mean all that sex trafficking, rape, child abuse, molestation at work, selling kids off to brothels in some poor countries, unwanted pregnancies, marriages with underage girls... and much more.