What really bothers me is there still seems to be the age old sexist double standard going on here. So a female MC can't enjoy sex and have as many encounters as she wants? There's nothing wrong with games that have a male MC that runs around banging every female in sight, but it's wrong if the MC is a woman that exhibits the same behavior?
A woman that buys a dildo is sexually empowered, a man that buys a ona hole or a sex doll is a creepy pervert. Defend this double standard.
The standard of women being looked down on for having lots of sex vs men actually represented exactly in homosexual men. Gays are looked down on for having thousands of sexual partners.
If women collectively approached sex with the same basic acceptance as men the sluts wouldn't be viewed as the oddities but as the norm. It's because most women don't have same open willingness for casual sex that men do that they are viewed as they are.
Men that do expand the effort to try and have sex with many women fail vastly more often than if they were women trying for sex with men. A real man slut that's nailing as many women as he can is only a slim shadow of what a homosexual man trying to fuck as man many as possible does.
It's all about deviation from the norm.
Not that this really is the point at hand. The real point is that Anna is cheating on her presumed loyal boyfriend. She has broken the implied trust between them to engage in constant sex with now basically any man that ask. (which is fine for gameplay reasons). But as a judgement on her character that isn't being mind controlled by the player, or taking on this sexual activity for a higher goal (mild blackmail aside).
TL;DR
Women in general not having lots of sex with many different partners makes the few women that do seem odd.
The negative judgement for having sex with many different partners is represented in males by homosexual men that have abnormally high amounts of sex vs other men.
We aren't so much all judging Anna for having lots of sex, but for breaking her obligation to her boyfriend.
Getting spit roast by the old men was hot as fuck.