Being a word guy, I often find terminology helps me makes sense of things a bit more easily. I ran across the word "partialism" where in a person focuses on a 'single part of the body', and unable to become aroused or reach sexual release in other ways or in relation to a whole person. In particular, partialists are so into their thing, that they don't necessarily get turned on by genetalia either.
Lol when I read that, I was like, "wait... genetalia turns people on?" So rather than calling my musclepreciation a "fetish" I've switched the terminology.
What it's done for me, though, is reinforce my understanding of my own normalcy. As well as help shape my sexual needs and expectations in a relationship. While it's not easy to at first to ask someone to do things that are new to them, it's much better than faking the funk and trying to create an expectation that you're "just like everybody else (whatever that means)".
The greatest sexual and therefore dating happiness for me is going to come from flexing, posing, conversations about workouts and physical exertion, muscle growth, measurements, and even comparison. Even if she's undersized or not that muscular, I find the attempt and expression toward my sensibilities goes a great deal farther than anything else.
Sex is a conversation, and muscle is the language I prefer. Depending on the partner, it could be a language they enjoy, or are good at speaking in despite it not being their favorite. That being said, I've also had to learn that just because a person expertly speaks my sexual language doesn't mean they speak any others.
As much as I love muscle, I've also had to tone down my questing for it as I wanted a more well rounded and emotionally fulfilling relationship. Muscle still gets the blood pumping, but love, care, attention, support, trust and appreciation count for so much more, and no amount of gym time will build that up.