Well we disagree. Catholicism holds there are immutable moral laws inscribed on our hearts from our Creator and revealed in scripture and through the indefectible teaching authority of His Church. 

Moral theology is a “normative” science as it seeks to discern good and evil, how we live and act well and rightly . Normative sciences, such as logic and moral theology, seek to establish the right way of doing things. These contrast these with the “descriptive sciences”, such as sociology and psychology, which purport to study the way things actually are. The latter change with the seasons. The formed do not.