Its hard for me to answer without it being theoretical.
When I was young and inexperienced, looking back, there were a couple of girls I was interested in, one who I went out with on a couple dates, who had a slightly 'slutty' background. It was not enough to stop me. I suspect back then I wished she had less partners, not because I thought it ruined her, but because I was embarrassed about MY lack of experience.
If I were single now? Well, I'd rather a girl with a higher then average sex drive, so evidence of that would be a plus. But if I'd been getting to know her, and she'd been friendly but not at all sexual with me, and I found out she slept around, I'd probably interpret her responses to me in light of her history as suggesting she wasn't interested, and move on. In retrospect, that was the case with the girl I mentioned before I went out with on a couple dates.
But if we'd been flirting heavily, it would not be a bad thing at all, I'd probably just turn up heat.