My mom wasn't conventional but even though she was very much part of the counter-culture movement, she knew she was a parent and not my friend, Morals and ethics were among the most important things she wanted me to have, and there were always clear, age-appropriate boundaries (like not wearing even a little makeup until I was 15, and I also couldn't go on dates where it was just the guy and me until I was 16). She was pretty strict. The only mention of my sex life that ever occurred was about 20 years ago when she mentioned how I had always made great choices in boyfriends, except for Tommy, who was this loser, Billy Idol-wanna be, poseur punk rocker I was involved with at 19. Without going into details I alluded to him being good in bed, and she said, "NOW, I know why you were with him!"
If Peter and Maddie end up together, it is going to be AWKWARD when his parents meet her parents. I would be absolutely livid about how my daughter was denigrated for daring to do what is best for her, and the backasswards lens their "culture" views her through. "I'm sorry your son is such a skank."