Also, correct me if I'm wrong but there was only 1-2 sex scenes per episode. In terms of rythm, and to have more chances to match more people's taste, I think it would be better to have 2-4 scenes. It would represent a bit more work, but you could also cut one position or 2 from long sex scenes to save time. I know I won't mind as long as you keep bjs and facial. Because if there's only one sex scene and the player is not into this particular girl, then he has to wait for next episode to really enjoy it.
And don't feel forced to make each sex scene the same length and intensity, that's what killing porn movies for me. In vintage porn movies, there were 7-9 scenes, all of various length from 3mn to 20mn and it was a nice variety.
Nothing refrains you from doing a full sex scene with Crusher, followed a bit later with a short bj scene with MC and some enseign, for example. What's even better is that it would allow sex scenes to be more interlaced with the story. In my example, the bj scene could be short because MC & the girl are doing it in some place they shouldn't be, and they have to stop because Picard enters the room, so they hide and they hear something they shouldn't have heard which then advances the story.
Stuff like this, if not always possible, is always more enjoyable than "story finished, now time for sex scene in a bed, then story continues". A bit of excitement is added if characters are not always having sex in a bedroom. Unless it's not their bedroom, and they can be surprised by someone
That's all I could think about right now.