My contention is that people have sexuality, regardless of whether or not it is expressed physically.
We're splitting hairs over definitions. My point is that people have lots of thoughts, some good and some bad. Unless you are mentally ill, you can train yourself to think in the way that you want to think. If you have sinful thoughts - lustful, envious, greedy, those need to be dealt with. But the punishment comes for giving into them, not for having them.
I once read a report about a society in some remote area where the men were fully homosexual until they turned 18, then they established monagomous heterosexual relationships for the rest of their lives. They were taught to think that way, and it worked for them.
And yes, thoughts have crossed my mind (I'm not going to detail which sins, but more than one) that I would be ashamed to act out. In order to train my mind, I learned to shut those down as quickly as possible. The Bible calls this "taking every thought captive" and it is a valuable tool.
Shalom.