I wouldn't necessarily hold it against anyone working in porn so much as working in the porn industry. The porn industry is violently against even basic things like condom use (and the list continues). Such resistance tends to mean justifying things with excuses. Since compromising would be to admit to responsibility. So why should I trust that someone working in such an environment isn't going to treat private data, important infrastructure or financial software the same? Random programmers from overall mediocre environments are quite easy to find whether it is porn or something else.

Edit: It is always funny how when you claim that people are biased and don't have arguments on Hacker News, they downvote you. People really can't get out of their heads. My point still stands. Good programmers doesn't have to go into controversial industries. They don't need excuses to justify how things "actually really are". The article says that the porn industry is "leading" in technology. That is bullshit. They might be leading in commercialization of certain technologies for a brief second, but that is all. How many programming languages did they invent? Zero.

Don't go into mediocre industry where people accept problems as a feature. All the people around will be there because they don't care about certain things and so won't you. You might not like it, that is up to you, but don't come complaining when you can't find a job after 40 because you haven't developed the skills companies are looking for at that age. Like identifying, solving and taking responsibility for larger problems.