My personal favorite is 'silver witch trainer' which is a mod of 'witch trainer' its a corruption trainer that's pretty funny and on this forum.
Orange trainer. You make Ahsoka from Star wars clone wars into a whore.
For this particular kind of game, they are on steam and on dlsite and maybe this website i just haven't looked for them here.
A Japanese game dev company called Oneone1 makes games like these where you play as a heroine and you have to lose battles to increase your sex technique and then there'll be stuff in the game world for you to increase your stats.
Another favorite is Material girl, you play as an 18 year old girl who is a virgin and you can choose how your character progresses (experienced)
I know these games from steam, steam has allowed these games on its network and they are fun.