I have argued this a bunch of times at this point, but movies should choose a target demographic and then go for it:
Make family friendly movies without awkward implied sex under covers or while wearing underwear and such nonsense. Something that I can watch with family without it getting awkward
OR
make adult, explicit movies where the actors are actually, explicitly, visibly fucking during sex scenes. Doesnt have to be straight up porn, just make sex scenes sex scenes.
TLDR: Make actual family friendly movies without, and actually adult and explicit movies with. The middle of the road stuff makes it awkward and/or unsatisfying for everyone present
Lars von Trier understands the ugly side of sex, which is why his sex scenes work so well in his films. The sex scenes in Breaking the Waves were definitely needed. They were also pretty hard to watch.