While finishing up degree number two, there was a young woman in my class who was a former stripper. She was very attractive, had a great build, a wonderful personality (despite being immature for her age - 26), and was very fond of me. I got to know her a little and finally asked her out. We were all set until, several days before, I discovered she had a "serious" boyfriend. She honestly was perplexed as to why I called things off; I really questioned her loyalty at this point - more to come shortly. She genuinely "dug me" and the fact that I was a better choice than her current, who I soon found out was into drugs and a plethora of other bad lifestyle choices.
We remained "school friends" while I kept her at arm's length. She still liked & trusted me and quickly opened up to me about some of her other problems that included, but were not limited to:
2 long-term relationships with heroin-users
her own (recurring) heroin use
having an abortion
stalkers from her "club"
firearms
an assault hearing
never having a "regular" job
and, maybe a few more that escape my mind at the moment.
Many "dancers" have a reputation for engaging in certain "side-jobs" of questionable legality in most states. She never mentioned doing that along with the above stuff, but before all of this, that possiblity weighed on my mind in so far as how involved I was willing to get with her. I knew she genuinely was trying to turn her life around early on, and so I was willing to give her a chance before making a final decision. In the end, I'm glad I didn't pursue anything more with her.
Anyway, in answer to the OP, YES - for me, something like that is a dealbreaker.
While mine is an extreme case, certain characteristics and practices don't always, but often accompany others.