If you already have a premium site, I'd avoid building a strategy around keyword stuffing or registering domains that mimic model names.
I'd focus on making each model page the strongest resource possible: unique descriptions, high-quality metadata, strong internal linking, related content, fast page speed, and a clear site structure. In the adult niche, earning relevant backlinks from reputable industry sites and building topical authority usually has a much bigger impact than chasing exact-match domains.