There's one game in this.... "Genre"... that I really like. That game is California Bound. In it you play as a girl who has done everything she could to graduate well, from high school, like her wealthy parents wanted, all so that she could go to the school of her choice with the college fund they'd saved for her. However, when she tells them she wants to go to school to become an actress, and not a doctor or whatever successful occupation they had in mind for her, they reneg on the idea of paying for her college. As a result she just runs away, makes her way to LA on her own in the hopes of making it big.
This premise is so important, because it sets our protagonist up with a goal, she wants more than anything to become an actress. It shows the beginning of her willingness to do whatever it takes to attain that goal, it takes a lot of guts to go against your family like that, and even more to leave a life of luxury to pursue a career from poverty. And that last bit is the most important part, it shows that she starts the journey with nothing. She will have to do whatever it takes to survive or give up on her dreams. As a result when the story later starts to force sexual situations on her, she has a motivation to accept blackmail and coercion. She doesn't have another option. There isn't a support system of family and friends who can help her and keep her safe. She has to get dirty to get what she wants. But, this doesn't make her cold and calculating like some other characters, Sabia, from Kingdom of Deception, for instance. Instead it gives her a sense of vulnerability. She is being taken advantage of, however the difference between her and the thousands of character's who'd be called "retards in lechertown" is that she isn't working against the player. Going along with the sexual situations is a path to her goal, so even though she doesn't want it, she will do it, in order to make things better, and that is the thing that really clinches it to have good writing.
A few other games I might suggest at least trying to see if you'd like are:
Vis Major: Awakening - In this one you play as a young rich girl who one night gets hit by a car. This knocks her unconscious, but in spite of the driver going so fast that he doesn't survive the crash, she gets up the next day just fine. This is the beginning of her discovering she has super powers. However, that's not all. It turns out that the guy who hit her was actually looking for her in the first place, he was supposed to kidnap or kill her, I'm not sure which, to ensure that no claim to her mother's company could be made. Her mother's company has been taken over by gangsters, and in this version of the game, her mother has only barely escaped with her life. It is now up to Cara to use her body, her newfound powers, and the skills that she will learn from a friendly spy, to infiltrate and demolish this criminal organization from the inside. Along the way she's gonna be subjected to plenty of sexual coercion and possibly even blackmail, and she'll have to weigh her willingness to do these things against her desire to get back her family's company. This game isn't written quite as well as California bound, but again it gives clear motivations for the character to go along with sexual coercion in the context of it's gameplay. However, it also makes it pretty clear at the beginning that Cara is being controlled by you. There are scenes where you choose not to have her cover herself up, for instance, where she'll wonder after why she didn't put on a towel, because "she'd meant to". Things like that. It kinda bugs me because it means that Cara is still a player antagonist, but the player ultimately has the power to force her, and that doesn't work as well as California Bound.
Kingdom of Deception - As I mentioned above, this game features a woman who loses everything, in fact, she was once a well to do member of a noble family and a military officer of some note, but after she's betrayed by someone back home she's ambushed by an orc war band hell bent on destroying her and her expedition. At the last moment, while fighting bravely, she is rescued by another band of orcs. Apparently this band had been working against the tribe's law, which required, after the war between their races nearly decimated the orcs, that they should stay out of the lands of men at all costs. So, you're rescued by this group, and allowed to recover, but then, as you were betrayed, you realize that it's important that, if you want to return home, you find out what happened and why. So you stick around for the trials to determine what happened within the Orc encampment and see if you can glean any new information. Along the way you decide to do whatever it takes to regain your power, even if that means working as a prostitute in the orc tents for money to buy equipment and favour. It is up to you to make decisions that will strengthen your position in the orc camp and possibly to be able to use them for your machinations.
Lastly, as someone already suggested above:
Coceter Chronicles - This is my absolute favourite game. Tabitha, the main character, is the ultimate Player Avatar. She does what you want her to do, she says what you want her to say, and she even thinks what you want her to think. There's an early quest in which you either watch from afar as a boy masturbates (you're unaware that's what he's doing) or approach him in concern over his grunts and groans, only for him to finish on your dress. If you don't he finishes and then you announce your presence. Either way he's startled and runs away. But it doesn't end here. You then have a choice to touch his semen or not, to taste it or not, and to decide if you like it or not. Each step of this shapes how Tabitha will behave later, and it's all a choice on your part. Later as relationships with the myriad of characters come to be, you are greeted with plenty of options show affection or not, letting you decide how into these characters you are, and how much they feel you are into them. This doesn't even begin to speak of the rich world building this game accomplishes, introducing us to new cultures and customs and a myriad of fae races, as well as demons, gods, mankind, and other beings that aren't fully understood as yet. This game has plenty of sex and Tabitha is either your willing powerful slut, or your demure but capable sex toy. Either way though a great destiny awaits her, and it's up to you to guide her as you see fit through this adventure.