With all due consideration,
Kāmesumicchācārā is not translated as sexual misconduct, but as the misconduct of actions motivated by sensual pleasure. And the Pali terms for desire for sensual pleasure abound in the Buddha Dhamma for wrongful phenomena that are to be abandoned and prevented from arising, such as kamacchanda, abhijjha, lobha, raga, tanha, all of them rather interchangeably translated as longing for sensual pleasure, yearning, wishing, lust, craving.
The entire Teaching of the Enlightened One revolves around the concept of annihilating sensual pleasure. Kamatanha, craving for sensual pleasure, is the root of all suffering. The cessation of suffering comes with the elimination of craving, while on the Noble Eightfold Path, the step of right intention starts with nekkhamma-sankappo, thoughts free from sensual pleasure. So as long as the proper answer is sought after, this is the actual explanation.
Any attempt at reducing the meaning to any other form of particular misconduct is just an excuse for hiding and distorting the true doctrine, fueled by attachment to precisely sense pleasure. And as a proper characterization of this tendency, it belongs to the category of mental fetters called sīlabbata-parāmāsa, namely valuing or holding on to false systems of morality.
Respectfully