I watched The Lighthouse with my dad a few years ago and I think that was the most awkward movie watching situation I’ve been in. We decided to watch it because it had Willem Dafoe on it, a positive rating, and it was on a streaming service he had. It’s not really a spoiler but the movie has multiple scenes with a focus on masturbation. Neither of us turned it off because we kept assuming that was the last of it and we would have had to get up for the remote.
I watched the Matrix 3 in the theatre with my dad when I was a kid. Sat very quietly during the sex scene and never spoke a word about it on the drive home.