Sacred Haven of Debauchery

Well, this is an obvious parody (?) of idols, where everything is reversed, but there are more girls, and the differences between them are much more noticeable.

First, Ment, idols can also be male. Second, there has been an entire genre of similar romantic games for many years, aimed at a female audience. And I was completely unclear about what "in games for a male audience, the appearance differs more" meant. The art style varies from game to game, both in one subgenre and in another. Here is one of the most famous male games of this type, for example. And here is a female one.

However, I can't say that idols seem interesting to me; I'm not a fan of harem games.

Not every romantic game is a harem game or revolves around idols. Although I don't deny that this is a very popular theme. Nevertheless, idols are a separate phenomenon. As a rule, it is aimed at lonely nerds, yes, but it is still separate.