Everything in moderation as the saying goes. Being too pre-occupied with sex is an unhealthy habit like over-eating. However, it is unrealistic to stop eating and also unrealistic to stop having sexual desires.

Like, with diet, with which we can exert some discipline to not over-eat; it is also possible to exert some discipline to not over-indulge in sexual matters. One approach is to just set a schedule for it, like once a week so that the mind isn't pre-occupied with it outside of that specific time.