That's something I've had to deal with (I work for a gaming company) - we always ask if the applicant has any objections to working in this industry (tho' we don't ask why they object). It's a bit weird sometimes, I remember one candidate we asked and he told us a long story about how his father-in-law had lost all his money gambling and how his wife would never let him work in that industry and we're like, so what are you doing here wasting our time? We've also had people quit (after a few months on the job) saying they didn't feel comfortable working in this business... How could anyone not know that upfront?!