Should you have sex with the photographer? Does it help your career as a model? Absolutely!
Seriously, of course not. Supermodel career in exchange for sex does not happen.
The issue is not that important because sex is no longer a big thing, but if you are worried or perhaps just curious, here are some thoughts:
No respectable photographer assumes that the model will have sex with him. Equally, no respectable model assumes to be offered work in exchange for sex.
No respectable photographer will "touch you up", but don't imagine that just because he touches you to move you into a position, he has dishonest intentions. Most physical contact is part of human communication and has nothing to do with inappropriate behaviour or sexual harassment.
If you honestly do feel harassed on a shoot, tell the photographer and explain why. More often than not, it is a misunderstanding. Make your feelings known in a calm manner. If you don't get anywhere, get out.
continued below, plus read about
photographer participation below
If you feel like having sex with the photographer - great; but stay professional and wait until after the shoot. It won't enhance your career, so do it for the fun - and don't be offended if you get turned down.
Photographer participation (in nude shots)
For most photography assignments, photographer participation is a definite no-no.
On pornographic shoots I am told that it happens. I have heard stories of how some photographers explain why they need to participate in a shoot: The excuses range from saving money for a second (male) model to the "noble act" of helping a client who suffers from a sexual dysfunction by providing stimulating photos.
I can imagine situations in artistic projects where photographer participation may be acceptable. You probably have to accept the artist's explanation and if you decide that it is okay, then so be it.
Generally, if you want to do it - fine (and put your best efforts into it), but don't fall for some pathetic excuse and regret it afterwards.
