Thanks for the feedback! There probably has been a bit of inconsistency in how we write that stuff, so we might look at what else we can do with how straight characters engage with other women. What do you think you would have liked to happen in those scenes?
Heyyy! ^^
Practically, I think it'd be simplest to give a straight player both options (like kissing vs not kissing, or other mild sexual actions) without progressing any les. romance paths. That'd probably require a minimal amount of alternate flavour text.
Otherwise, you might consider giving the player the choice to decide how flexible/averse their MCs are to these actions as an additional Char-customisation choice on-top of their chosen sexuality. Then cross out or block the relevant choices or scenes that accord with their flexibility.
Just some loose shower ideas haha