Well, i love these kind of questions.
I have been playing adult games for a long time now (currently i play 25 games i like).
For me it also started with living with temptation and Eleanor from Lesson of Passion so those games still earn a mention but currently if i had to name 3 it would be:
1: Being a DIK by dr PinkCake: Everyone their own opinion but for me this is the perfect game, the humor, the ladies, the plot, the consequences and all of that done by one artist, it is absolutely stunning and unbelievable. I have lost many hours playing this game and experiencing all of the different routes available.
For me the biggest reason to play is a compelling plot and if possible good twists, and this game also greatly delivers on those 2 points.
2: The DeLuca Family from hopesgaming: wow wow wow wow wow this number 2 is super easy, barely an inconvenience for the men of culture who will understand this reference: Fantastic plot, great character building, i want to romance all the ladies so well written as they all are, the chapter "my name is Luna" is just the best written chapter to date, i even cried, which is quite unexpected and something i would never have dreamed of playing adult games lol.
3: Good Girl Gone Bad from EvaKiss: The story is a bit less interesting here but those graphics and the VERY lewd scenes are the hottest i have ever seen in games. You can really get perverted and forbidden in this game, when the female MC is being drugged by the father of her boyfriend and fucks him lost in lust it make me laugh and horny at once, so many great scenes that game.
I must say the more i think about this the harder it gets for me to choose 3 but there you have it.
But of course i cannot stay fully honest and must mention at least 10 games that also blows my mind:
Honorable mentions:
1: Acting Lessons by DrPinkCake , the first game i know from drPinkCake and what a debut it was, man i love that game and it still has the best secondary character of all time Liam who made me laugh and cry! Love you bro! That is how side characters must be written.
2: DMD by mrDots, the one that started my fascination for Ren PY games, yes it is a bit to vanilla and man it took a long time to get there but i still love it regardless.
3: Red String by EvaKiss: Still in development and very impressive, very cool characters
4: School of lust 3 and meteor by Goblinboy: AIF games, man this is old, you have to type commands but the 3d art and the stories are very very good and very lewd, and are still cool to play.
5: Working man by Ice: also an AIF game like the 2 above, also a very very hot story about corruption and cheating, and very very lewd and forbidden, i like the forbidden stuff lol
6: City Of Broken Dreamers by Phillygames: i love me some SCI-FI so this bladerunner/altered carbon esque adult visual novel is very nice to play, the story is good and the art is hot.
7: Something is in the Air by Ariane Barnes: the first novel i played without me knowing what renpy was, cool story with humor, good characters and some cool plot twists.
8: Intertwined by Nix: great story, great graphics, hot characters, what is not to like?
9: Jessica O Neil's Hard News by StoperArt: This game could even have been in my top 3 as it has my favorite fetishes, corruption, cheating, incest, and a female protagonist, but the lack of progress frustrates me, the story is perfect and has so much potential, and i truly understand how much time such masterpieces take, but for me, my opinion, the content created between very long waits is just not good enough. But until now, the game and story and twists are perfection for me.
10: Living with Temptation/Eleanor 1: i must put them in here, as said above, this is what started it for me after the older text based adult games, the cheating and the corruption was so much fun then even if the sandbox and time elements and the lack of saving were very annoying, the themes and fetishes were very very hot.
Well, sorry i couldn't stop talking but i named my 3 best so that counts LOL .
I really wish there were more adult games who are and very lewd with lot's of fetishes but also with compelling stories and great twists, but i must say the quality of these games are getting better everyday since there is money to be made by the artists!
Greetings, realkane