Spoilers ahead. All these games have some or all of what you're looking for.
A Town Uncovered - has some pretty sexually liberated girls. IIRC you can get a BJ from a girl the first day you meet her. You can get blown by LIs at a gloryhole and they don't know it's you until you're done. But, you can also catch one of them blowing random dudes as well.
A House in the Rift - first girl you meet is a succubus. You can fuck her pretty quickly. And there is some sort of corruption that you can do with her. The second girl is a Pirate Witch you can fuck pretty easily. But, she's built like an amazon. Plus some of her scenes are on the fem dom side. They're avoidable though. There's also an Orc that you can fuck pretty much right away. But, I don't know if I'd call her slutty. She thinks she's dead and has to submit to you.
Summer with Mia 2 - your aunt has two flashback scenes where she hoes herself out. Your therapist throws propositions you in the men's room. There's a girl that you catch your aunt's lesbian friend fucking that opens her legs for you pretty easily.
Mythic Manor - also has a succubus who works at stripclub with whores. You don't see her fucking other dudes. You see a picture of your mom's friend sucking a random stripper's dick. Although that might have been removed. You get to fuck her eventually. There's a camgirl that becomes an LI or you find out that LI is a camgirl. It's been a while and the game is a sandbox.
SuperHuman - another game where I'd call the girls more sexually liberated than slutty. MC loses his virginity to a stripper who basically jumps on his dick. I apologize this is going to get confusing. The game is a VN but, it lets you decide how you spend your free time of which you have a lot. So, you can meet one character in particular that you can fuck on the beach after meeting once or twice. Or you can do a fair bit of their side story before that happens. Also, I said their because you get to decide what gender they are.
Fetish Locator - literally a game about a fetish of the day app. You can fuck other people's girlfriends. Avoid the lawyer if you don't like trans content.
City of Broken Dreamers - has a couple of girls who practically throw themselves at you. It has been awhile since I played the beginning of the game so, I can't remember who you have a previously established relationship with. Also, the production values are insanely fucking high for a porn game.
Harem Hotel - they're more sluts for MC than anything. At one point you wake up to a girl giving you her virginity. But, you can buy and make them wear slut outfits. Which change their dialogue to reflect that. You have to train their submissiveness to get them to wear them first. There are some elves you can make into sex slaves or LIs. Some of whom prefer the slave route.
Being a DIK - I know odds are you've played this game. But on the off chance you haven't I'll list it here. If you haven't played it I think it has basically everything you're looking for. If you have I'm not going to waste anymore of your time.