I am the younger generation, and I have to say, every girl I've ever met who has been with an uncircumcised guy has run to her friends afterwards and said how much it put her off. Bearing in mind all my friends are around the 21 year old mark and are incredibly superficial, but that's the standard response. Personally, I don't care a hell of a lot, but I do prefer the look of them circumcised, which is what most girls base their responses on, the way they look.