Does “sexual attraction” seem like an obvious concept to you, or was it unclear for a period of time? If so, is it still confusing?
To me, “sexual attraction” has always seemed pretty clear-cut: if I’m sexually attracted to someone, I must be experiencing a desire to engage in sexual activity with that person for my own enjoyment. This desire might be strong or weak. At least, that’s the way I define things in general, because for obvious reasons I don’t experience this desire.
Occasionally people run into my old post about the invisible elephant and take it upon themselves to explain to me in great detail what sexual attraction feels like, which I’ve always taken as well-meant but annoying. Their definitions sometimes intersect with mine, but often don’t. For example, my definition doesn’t necessarily involve arousal, because arousal happens in response to things besides “desire to have sex.” It is also known to occur in response to strong emotion (for example, fear and anxiety!) and for no reason at all.