"As long as the site isn't true-blue porn, I wouldn't sweat it. In other words: if the site caters to people looking to hook-up, no big deal. If the site caters to people looking to pleasure themselves, this is perhaps a problem."

In my opinion this statement is pure stupidity. If you can code and you are the best candidate then you should get the job. I have done extensive work in adult w/ some of the largest adult companies around and I can promise you that the technical challenges of a site that does that type of massive traffic are greater than or on par with what you will encounter at your typical job.

As long as you don't make or appear in porn you should be fine.