It was working at a porn company that caused me to add Perl to my languages list. I did work on their non-porn sites, too, which are the ones I mention during interviews.

Most of the time it wasn't particularly different from working on other web-site assignments.

On the other hand, if you alter the client-side javascript or the server-side code for some page, you have to verify it works right. I enjoy pointing out that most companies fire employees found with porn on their screen. At the porn company, it means you're doing your job; you get fired if you NEVER have porn on your screen.