Oh, dude, I was in college in 2002, back when you could see every computer on the campus network, and I found a copy of this game while browsing through peoples' music. This, and that game where you go to a mansion full of women who all turn out to be different kinds of crazy. Can't quite...
Mummy Love drew me into the Shark's Lagoon! Not exactly a game, but most things SL came out with were pretty linear. Can't seem to find that story anywhere now, though.
Katawa Shoujo. This AVN was groundbreaking in its time for its focus on imperfections in its love interests and, I think, really put a spark in the story-driven products we see today.
Generally doesn't bother me, except when there's intentional humiliation involved, or the MC is actually monoamorous. Given the sexual freedom MCs have in most games, it's kind of hypocritical to not expect that in others.
As for the games with NTR as the main theme, it's not my favorite...
Does Duke Nukem count? My uncle had it on his computer when I was an early teen and I remember being able to tip the strippers and they'd flash you for a couple of seconds.
If you want a training game not by Akabur, check out Wife Trainer. Still incomplete, but has a ton of content. Uses real images, but has enjoyable gameplay.
If it counts as a "game," Shokushu High. Old web-based exploration of a tentacle-filled school, where the images were all taken from other, mostly Japanese, titles of the 90s and early 2000s. Still around, though it has been revamped a bit while still maintaining its old school appearance.
Personally, 9 was the one I couldn't finish. I had quite a few friends into 7 when it came out, so the social aspect of discussing it with friends may have contributed to its favor, but 9's characters didn't vibe with me and I quit shortly after recruiting the blue mage...creature. Tactics has...