Some suggest it was a reaction to Canaanite or Egyptian practices linked to idolatry or religious ceremony, so “abominations” are acts particularly associated with ancient pagan cultures.
Rav Kook (Shemonah Kevatzim) offers a spiritualized reading: distorted sexuality can pull people away from higher moral or relational development.
And yet:
Many modern Jews are troubled that of all things, this is called out as “abomination” (תּוֹעֵבָה, to’evah), a word also used for the eating of impure animals (Deuteronomy 14:3), or dishonest business dealings (Deuteronomy 25:16). The word does not inherently mean “evil,” but “ritually or culturally taboo.”