I feel like it's still pretty strange as it is now, but in the future we will probably have better AIs implemented on sex robots and those probably will feel a lot less awkward
Ecchi Sensei and Estate: Dominate, really sad that the latter didn't get much of a chance and got abandoned with almost no content at all, but it is still legendary
I personally don't really find RPGs enjoyable for porn games, and it doesn't help that most games that use RPGM look like shit. Also, some good RPGM games get Ren'Py ports/remakes, so it's also a way for people to enjoy those stories rather than actually playing the RPGM version