What was the first foreskin sighting for you, in porn?
Mine was (pre-Internet, 1989) a booklet of porn stills, advertised in the back of a “regular” porn magazine – maybe Hustler or similar. I mail-ordered the booklet, called, “Girls Who Love Uncut Dicks.”
It thrilled me to see women handling foreskins. Prior to that, I never saw an intact penis in porn.