To stress that gay sex and even gay attraction are bad for the soul and bring about unhappiness and sorrow is as much a task of ethics, whether natural or grace-enhanced, as it is a task of medicine to point out that lack of exercise is bad for the body.
Or we might say:
To stress that gay sex, etc. are bad for the soul is as much a task of ethics as it is a task of economics to point out that inflationary credit expansion gives rise to business cycles.
Neither ideas are “popular” today, but they are true nonetheless.