If modernist naturalism were true, there would be no objective truth outside of science. In that case right and wrong would be a matter of cultural preference, or political power, and the power already available to modernists ideologies would be overwhelming.
Sexuality is a big issue, but there are others - how much you commit to a relationship, to social obligation, to honesty and being honest with yourself.
Personality has power to uplift, power to depress, power to curse, and power to bless.