Are there policies? Rules that say the actors don’t have to sleep with the writers or directors or producers before they’re filmed screwing each other?
Have there been any legal cases related to this?
Oops, that would be “sexual”.
My guess that anyone working in an industry where “could you please take off your clothes and demonstrate your skills at fellatio” is a valid job interview question is going to have a difficult time making a case for sexual harassment. No doubt it’s possible in theory, (as in “I know I had sex with you this morning at the audition and we’ll be having sex again tomorrow at the taping, but how dare you suggest I come back to your apartment tonight!”) but in practice, I’d guess it’s never happened.
There’s a summary of some of the aspects of the law here (I think that page is safe-for-work, but I can’t vouch for any of the links). However it doesn’t give any specific examples of cases.
I suspect that, as that article describes, the ‘respectable’ portion of the porn industry is necessarily so hot on legal matters that they have watertight contracts and procedures. As for the problematic fly-by-night parts of the industry, it’d be more like trying to sue a pimp for the same crime.
Wow, and I thought I knew all of the “Drive in parkways, park in driveways” situations. This one is going to bug the hell out of me for the rest of the day. And its just 8 am!!
Maybe a good ol’-fashioned blacklist for troublemakers? I imagine the porn industry is fairly close-knit, and one bad apple quickly gets shunned by everyone else.
FWIW, I remember seeing an interview with Ginger Lynn, who mentioned that she’d never had any casting couch problems until she tried to break into the “legitimate” industry.
How do they deal with sexual harassment?
They film it. 
If we’re looking at serious answers to a serious question here, there’s a simple solution – forcible sex is rape (or forcible sodomy) regardless of whether the people involved have had consensual sex at other times. Likewise for coerced sex.
The logic to be dealt with here is – “Yes, I agreed to perform a variety of sex acts as described in this script with Joe Studly while the cameras are running for the three days it will take to film this porn spectacular. I did not agree to sleep with the director, the cameraman, the producer’s horny 15-year-old nephew, or anybody else.”
But sexual harassment takes many forms, most of which aren’t covered by that description.
Yeah, saying “Nice tits” to somebody could be acceptable or not depending on the circumstances, if you’re in the industry. But definitely not in my office. 
Another factor is that the actresses have a lot of power in the porno business. There’s a constant turnover and need for new “talent”. Established stars are able to set all kinds of conditions on their jobs. So it’s tough for potential sleazes to try and coerce actresses when it’s easy for them to walk off the set and immediately get another job at the studio down the block.
Do you have a cite for this? It doesn’t seem like the high turnover would result in the kind of power that you suggest without some other factor. The fast food industry, for example, has high turnover, but the fry chefs don’t exactly have a lot of bargaining power just because they can get another job down the street.
I have to think the harassment issue would be sort of a non-issue to some degree, as a just getting started porn actress, with little power is either going to consider it to be part of the job (so long as it’s a verbal request and not forcible), or she will say no to freebies. If she’s a headliner with some power, then she makes up her own mind, and tells the asking party to get bent or pay up.
Beyond this I don’t know how much closer to a hooker, re the physical nature of the job, you can get than a porn actress. If the person asking for sex is paying with cash or job that pays cash, then I would imagine she is probaly less likely to consider it “harassment”, and more likely to consider it to be part of the job.
There are plenty of jobs in the porn industry besides “acting”, all kinds of technicians and or artists who don’t go nefore the camera. Even for them, I’m failing to imagine how they can avoid a “workplace environment” that would be by an community standards, sexually intimidating.
I don’t know exactly what laws apply here, but I’ll bet you none of them provide exemptions for the porn industry. So they ought to be held to the same standard as any factory.
But there must be something wrong with this picture. If that’s true, some boy or girl ho’s with sharp lawyers (maybe working for hummers :p) would have carved up the production companies like turkies. Could it be that the industry is more respectable in a professional standards sense than it is given credit for.
Why does this surprise you?