It's not completely out of the question in L.A., where lots of porn gets shot at. A friend in the industry said that it's hard for porn industry ppl to date others outside of the industry, simply because of jealousy and trust issues that come with their work. If I knew in advance, I suppose I'd continue with the relationship, and try hard to keep my cool knowing she's f*cking other guys, because that's her job. But even knowing that, I think it might get the best of me eventually, but if she's quite a woman, I might hold on.
If I found out mid-relationship, I suppose I can be understanding too, because not every porn actress may be the most comfortable admitting it, and again, how relationships with ppl outside of the porn industry tend to crumble because of trust and jealousy issues. I'd try to be understanding and take it from there...
btw: I forgot to mention, my friend said that though there may be heart aches at times, jealousy, resentment and trust issues that rise, a 3-some is always a phone call to her girlfriend away.