I understand what OP means. He (?) is saying that when a woman starts to have bulging muscles, a la the bodybuilder look, it isn’t attractive, because their body looks more masculine and less feminine.
I feel the same way, I love the look of a toned, athletic woman, like the typical yoga or volleyball/tennis body, but when they start having visible definition and bulging muscles it don’t find it attractive.
I’m a dude as well, as to OP’s question, I’ve also heard that some women prefer the dad bod to the Arnold look because muscles aren’t soft to lay on.