They don't have the resources to make 5 minute long intimate conversations with foreplay and an ecstatic climax because cut scenes are expensive to make.
They *might* actually have some intimate nude conversations here and there-- perhaps like Triss and Geralt did at the beginning of tw2, and there was mention of there being "meaningless" sex and presumably other kinds of sex that's more romantic (perhaps plot related/considered more important). I suppose it's going to be a little more serious like, for example, GoT which is media most people are familiar with by now-- but you're right, they're probably not going to make any conversation a part of the sex scene-- maybe before or after. It'll be interesting to see how they go about this.
I just think once you recognise that this is a relatively mature game and you're like me you're probably going to take the piss out of anything that could seem remotely silly. Maybe the balance of humour and seriousness that the Witcher universe is so famous for will probably mitigate this need that I apparently have. The mocap suits and VA grunting is a thing that I either can't unsee or will have a hard time trying, so if there's nothing absurd elsewhere, I'll be cursed to be disconnected from the scene forever.
also this isn't actually a problem, just something I'm going to have to learn to accept/deal with. also it's hilarious and I can never pass humour up.