They're going to love the unintended consequences of the day some 13 y/o girl 'falls in love' with some pedo 10, 20, 30 years older than her, and says it's not illegal because he 'identifies' as a 14 y/o, because that's how he feels on the inside.
Or that student that 'identifies' as a cat and sues to have a litterbox in the restrooms.
Or take your pick.