Consider the third of the Five Precepts:
Kamesu micchacara veramani sikkhapadam samadiyami
I will train to refrain from wrong-doing with respect to sensuality.
To recycle from 2 posts ago:
The Latin word mōrālis relates to individual manners. Moral virtue is the middle way between excess (hedonism) and deficiency (complete deprivation). Being moral is conforming to a personal value system and having consistency in your decisions based on a mechanism with foundations in responsibility and balance.