You definitely have a point. And btw, I don’t really agree with the “fit” part of the definition. I don’t think that’s how we use the term for real. Twinks aren’t muscular, they’re skinny. Even frail sometimes. Though that may be changing.

The origins of the word are controversial, though I tend to agree with the people who hold that it began as a general anti-gay slur used by straight people in the 1950s. I remember when it was used that way. So, I get your hesitance.