I am 33, first gen American. Father uncut. I remember as a young kid running around naked and my parents' friends asking why I they didn't get be snipped, and them saying they didn't think it was necessary (one thing I am very grateful for)
One time a girl in high school was asking about uncut cocks at a party and it got very awkward. I didn't engage because I was too shy back then, but nowadays I'd definitely go up to her in private
One time in college I got into an argument with a (male) friend about circumcision, he couldn't believe I was against it (he was korean though, I hear they are pro-circ ?)
Then as for sexual partners:
#1, in 10th grade, both virgins. She seemed confused at first but once she figured out how to slide it down she always kept it down. Wasn't together long enough to do too much unfortunately
#2, in college, she was a virgin, but very kinky. By this time I was on the earlier versions of this site and developed a major foreskin fetish, which this girl took to very well.
#3, older more experience girl, I was early 20s she was late. First few times she just slid the skin back, but after seeing me move it up and down she figured it out, but we weren't together much longer after unfortunately
#4, my early 20s, she 18 and virgin, she also just slid the skin back
#5, my mid 20s her late 20s and very inexperience, but very horny and probably hadn't been with anyone for years if ever, but watched a lot of porn so gave a better blowjob than much more experience women I have been with, and though she was confused by the foreskin and even called it weird, she was latina so probably was vaguely familiar with it as she was very good at sliding it and sucking both skin up and down. Unfortunately we met at an anime convention and even though I got her on facebook we never met again. Tried to reconnect with her some time ago and she showed no interest, maybe one day that anime convention will happen again and we will both attend and maybe can connect then
#6, my late 20s and her mid 30s, they were gender neutral person with a female body, never had seen uncut before despite being puerto rican (I don't know if they circ there?), she was intrigued by it and would often nibble the skin. Despite the sex being good we didn't get along very well as friends though, so would infrequently see each other and there wouldn't be much communication
#7, my late 20s her mid 40s, one night stand, she sucked me skin up and deep throated but didn't pay any special notice or mention of foreskin one way or the other
#8, my late 20s her mid 40s, FWB, at first she would just pull the skin back and then bob up and down, but after some time together I got her to pay more attention to the skin as well as use some more variety in her blowjob techniques, however she isn't very interested in the skin one way or another, she'll just do what I like
#9, my early 30s, her late 20s, FWB, latina so was familiar with foreskin and even asked me to slide it for her back when we were sexting before meeting up. She is happy to do whatever foreskin tricks I ask for, but unfortunately she lives in another town a few hours away and also now is in a relationship, so missed some good opportunities with her
No other significant foreskin or circumcision occurrences in my life that come to mind so far, but it's always on my mind for any partner I am with