I never got explicitly turned down. But I suspected it once, when this girl started unexpectedly sucking my cock, then suddenly stopped and said, "I can't do this."
She was pretty flaky, so I took it to mean she had changed her mind about sex entirely, and I left. That was our second time fooling around, but the first time she got to my penis.
Only a good while later did I imagine it might have had something to do with my being uncut. That made for a hot fantasy where she invited me over to jerk off while she sucked her new, circumcised boyfriend's cock.
I lost touch with so I'll never know. I've had sex with a dozen women. I never felt the need to say anything about my foreskin because I knew it wasn't a defect. When we did have a discussion, I found most of them were indifferent, a few wanted to know why I was intact, and a few wanted to play with it specifically because they wanted to feel how it works.