Well you can't always say OF COURSE LOL.........
Some people grew up as nudists and in a nudist environment and wound up dating people they grew up with. I didn't grow up as a nudist, but I started sleep nude at 13 and when I went on my own at 18 I became a full fledged nudist.. When I was a kid from around 6 YO and on, my buddies and I were nude all the time, especially at camp and when the local kids hung out at the local lake or river, we all skinny dipped. So that's were I got my first look at all different types tits and pussies and to be honest cocks as well... And that's where the girl/ladies got a look at all different types, size and shapes of soft and at times hard cocks.... A few buddies later on, went on to date some of the girls, so the first time they really saw their cocks, while skinny dipping they were soft. I met a couple of women at the nude beach or the nude resort, which after a little time lead to dating, so they saw my cock soft several times before they saw it hard and I basically got the same reaction,
WOW that was very deceiving, I was never expecting your cock to get that thick and big...