Morally speaking, the ancients said that "the head of all evil" is by no means empty talk. Even normal couples should exercise restraint. Lack of virtue is definitely not conducive to health.
From the Buddhist point of view, lust is the heaviest worry of all beings, which can confuse the mind, is also the root of reincarnation and the inducement to fall into the three evil ways.
Medically speaking, excessive sexual intercourse can lead to kidney deficiency, and kidney is the foundation of life.