This might make you feel better: Of the five bi/bi-curious love interests, only three are specifically written as bisexual, and only two of those are actively bisexual. The others may or may not engage in lesbian sex depending on player choices. The two that are actively bisexual will be fairly obvious early on.
At least, that's the plan for now. Shit might change later, depending on how the story progresses (and on how much I want to piss off the people who hate lesbian sex; I do enjoy pissing people off, so you're forewarned on that front).