I feel like every exhibitionism game has rape, corruption or the character being forced into it. I wanna know if there are any exhibitionism games where the women is into it since the beginning, like I Love Exposure or flash cycling
You could try ProjectSAGE, it has some exhibitionism content and you can choose to avoid most of the blackmail by playing her the smart way. Coming of Age is centered on the exhibitionism theme, and it's the MC's choice, nobody forces her to do it. Naughty Lyanna is also a good game on this theme, though she's pushed into it as some dare at first, she quickly grows to love it.
This game has corruption, but it is a supernatural "go into the mind / change their dreams" type corruption instead of a physical corruption like a trainer. It's also an incest game. That said, the main LI is the MC's sister who is into exhibitionism out of her own interest.
This is very similar to Harem Hotel. You can pretty much progress almost character in any order at your own pace, and a couple of them are into exhibitionism. The game is light-hearted, charming and joyful. The girls are happy to share their kinks once you get to know them; no corruption or force necessary. It's contemporary fantasy; every girl is a mythic creature hiding behind a human facade (redhead milf is a phoenix, another girl is a water elemental / mermaid-ish girl, etc.).