Re: From a legal perspective...
"No, because it's not "produced solely or principally for the purposes of sexual arousal". The main purpose of a modelling site would be to sell modelling services, if you get your rocks off to it that's your business."
If that were true, they could do that displaying more decent outfits and fewer of them. Plus, in many of the sites I'm noting, they don't leave a prominent "looking for models" page, or if they do, it's pretty small given most modeling agencies are limited to one, maybe two locations. It's easily open to interpretation, especially if a site shows ONLY swimsuits and/or lingerie and doesn't show a prominent "models wanted".