Looking back at the earlier m/f discussion, I just finished watching Adventure Time, and I think it could be a great non-toxic template for m/f romance:
-The male protagonist is powerful in some ways (fighting), but weak in others (social grace, age)
-All of the love interests are in a socially higher position (princesses) and can’t really be dominated by the protagonist
-The LI’s all have their own lives and interests, and the PC can’t automatically make everyone love them (like PB being more interested in Marceline/older people)
-The LI’s don’t put up with mistreatment (Flame Princess)
I know the Heart’s Choice format doesn’t always have a large group of love interests, but I think these same elements could work well in a game with only 1 or 2 LIs.
These were just some thoughts I had, more hypothetical than anything else.