I think sexual harassment seems to be a problem in the modeling industry simply because there is a high concentration of beautiful women.
Emphasis added. That's 1 factor, and I'll just say the one you see. It's not just that all the women are beautiful, the Photographers et-al kinda get used to being around beautiful women all the time. Talk to a Bouncer at a strip club, or the bartender, or any male that works there, other than the manager. Now, we (Myself included, I have been that bouncer at several sex clubs) are charged with Protecting all those hot women that dance sexily, for money. That's the Position. Our Role, and you tend to get to know those women very well, as People.
Better than the regulars that get to stick bills in their G strings for lap-dances. That's a different role. The Photographer, Manager, Producer, and so forth, he has a role of Power over the models. Same with dance instructers, even gay ones. Same with Drill Instructors, even straight ones.
"All right ladies, line up. Aten-shun!" Walk down the line, inspecting them. Their clothes (Uniform) "Suck in that gut, Private! You eye fucking me? Eyes front, not over here, you don't listen with your eyes, listen with your ears."
Discipline. The D in BDSM (When it doesn't stand for Dominance.) The Photographer, for example, plays the same role: "Smile, now turn left. Shake your hair out, that's right, beautiful. Now, slip that strap off your shoulder, show me a little..."
Context. Either you can work with beautiful women, even strippers, and see them as people with feelings, or you can tell them what to do, make them look beautiful, and Objectify them. These industries tend to attract men, and women (Women do it too) who want to see beautiful women as sex objects, and they tend to take positions where they can Control them. The industry is about Beauty. The Position of Sexual Harassment is about Control.
Among other things, but that's one example I think you can understand. (Without ever having been a model, or sex worker.)