Like a lot of games, it's constructed so the player can 'pretend' that the MC is a lesbian, even if she obviously isn't. It's hard to avoid that she obviously enjoys having sex with her husband, even if you try to make it so they don't get any within the game.
I tried to do that on one playthrough. But as you indicate, it just feels hollow and like I'm going against the natural inclinations of the character. So I don't bother anymore.
Most blackmail storylines seem to require a suspension of disbelief, when the otherwise smart heroine suddenly devolves into bimbo mode, so we get a pretext for her abruptly deciding to become a complete whore.
