I agree that there are 2 issues with Witcher 3:
1. There are a lot fewer sexual encounters
2. Encounter cutscenes are repeated with tiny and limited variations, using the same female model
For number 2, I guess it is similar to Witcher 2, where there was also quite some overlap between sex cutscenes, but even so, I thought there was more variety in Witcher 2, especially with plot characters.
For number 1, I get the sneaking suspicion that it has to do with Gamergate and "portrayal of women as meat in games", that made CDPR drastically reduce the encounters Geralt can have.
Heck, saving the Elf in Novigrad from being harassed makes her go all feminist righteous on you.
It however doesn't really fit Witcher 3. You can walk next to Strumpets and they will ask if you want to spend the night with them as the ambient dialogue, but if you try to interact with them, they all tell you go keep your hands to yourself.
It seems that Witcher 3 overall seems to have gone down more the route of "romance someone for sex" rather than "sex as gratitude/quest reward"
Overall, I would have liked a mix of Witcher 1 and 2: Get a card for every encounter but also get a nice cutscene that has variety and doesn't use the same model and sounds each time. To compensate, reduce the number of encounters to maybe half that from Witcher 1 (not counting brothel girls), which would be slightly more than Witcher 2 and maybe triple what we have in Witcher 3.
The Witcher isn't a sex game, but it revolutionized sex in video games and it is part and parcel of who Geralt is. Players who don't want to pick the sex option can always opt out in dialogue, so it isn't forced on them, but having OPTIONS and CHOICES would be great.