Not to nearly the same extent, no. If someone has power over you and you refuse them sex, they could potentially do you all kinds of harm. If someone is very sexually attractive but has no power over you, then the worst that they can do is leave you a bit sexually frustrated.

In other words, being offered sex with strings by an attractive person is hardly as bad as being threatened by a powerful person.

>I think you have to be very very careful when you start labelling things as moral or otherwise.

Behavior that is clearly wrong is clearly wrong. The danger lies in not calling it out and allowing it to become normalized.