So, why the so-called "imbalance" at this point of an incomplete game (I cannot stress this enough)? Because most of the male characters Jessica is expected to eventually cheat on Conner with given the right set of choices either have an element of danger and taboo that must be overcome with effort (the Senator, the Mayor, Mr. Birch, Duncan?), or do not yet have that element of taboo or social advantage that could conceivably make them attractive to someone like Jessica (Tommy, Parker, David?). Parker had to look cool and useful for example, to get that hand job. That takes more story build up. Sex with the non-Conner male characters then are treated as either climax (cheap lol) or denouement, story wise. This means they come nearer the end than the beginning. By nature of this narrative design, it is unfair to call it "imbalanced" for as long as the game isn't finished. Give it room to get to its spots. Of course, all of this whining can be headed off by stoper working faster, lol!
Now, why are the girls "easy mode"? Removing the idiotic assumption that "lesbian sex doesn't count" (which stoper, I think, doesn't make), another way to justify it is that it's perceived as safer. If we're going to discover ourselves sexually, it is easier to think of doing that with someone who can't get us pregnant, and who we think will look after our needs better than your average two-pump chump. Plus, we're no strangers to finding fellow women attractive.
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. The downside to this is that there is less of that erotic charge that comes with overcoming a taboo. (Lesbians complain all the time about how lesbian movies are usually "coming out" stories, but watch anyway because overcoming a taboo is hot...) Stoper has handled it fairly well, I'd say, especially since it looks like both Heather and Jessica are breaking personal rules to keep going past where the "easy mode" should end, adding to that erotic charge. It's also why Jessica x Eve is the pairing I am most looking forward to. Although I do like me some "easy mode" Blake too. Maybe the taboo will come from her dad being opposed?
Also, I do not agree that the straight route is the "basic route", because taking the lesbian route feels just as natural. You can tell when the lesbian option is just tacked on. It doesn't feel that way here. I don't think stoper designed for a singular "basic route" or "canon route".
TL;DR The "imbalance" is natural to a female MC game like this because it's trying to replicate female MC romance novel structure and trying for a female MC mindset. Do not judge its "fetish balance" at 30% complete. Judge it at 100%.