See, I don't consider this particular scene to be porn. It's just a woman undressing and jumping in a pool of water, with the clumsy warrior man struggling to take off his own clothes because golly! he sure would want to be in the water with the naked woman too! That's funny! Fuck's sake, people. Then there's light sexual content before the scene ends.
Not porn. Just a cute little scene.
I think this says a lot about the mentality people in North America have towards sex. In some parts of the world, people don't take sex completely seriously and can look at sexual content
without being aroused. Meanwhile it seems like Americans have this weird thing where everything sexual becomes some kind of messed up voyeuristic peep show designed to get you off, but don't tell anyone because then they'll think you're weird and unwholesome! Lighten up.
As others have said, the sexual content of a scene can be used for many narrative purposes, including character-building (how people have sex can say a lot about their personalities, as well as their emotional connection), plot advancement (yes, people can bond using sex), comedy, and so on. CD Projekt do not really treat it as pure titillation nor is it intended to be seen as such. I'm not saying they are perfect and artistic works or anything, but to call it pornography is also a pretty limited view and says more about the person making the accusation than it does about the content of the scenes themselves.
Let's put it another way. Pay attention and you will notice that the content of the sex scenes changes significantly based on who is actually participating. Geralt, when having sex with Triss, is obviously infatuated. He behaves like an inexperienced kid at times, behaving rather clumsily, and yet at the same time obviously near-worshipping her in his obvious respect for her. Yet when he has sex with others, such as prostitutes, it's clear that the relationship is very different - we see him treating them much more as sex objects than as people to be cared for. That he also is rougher with yet more characters, like Ves, says something else about Geralt and about his partners.
This further reflects upon his character as a whole because we get an understanding for how and why he treats people certain ways - and surprise, it might not all be positive, and we might even look on Geralt as a different (more human) character when we see what we may consider to be flaws.
CD Projekt clearly put some thought into these scenes this time around. The question is, did their audience?