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The dex entry would’ve been fine if it mentioned bored trainers simply asking Zoroark to show them illusions, for entertainment and whatnot. This is wrong in the sense that trainers who have a Zoroark aren’t interested in the Pokémon itself, but rather its ability for their own selfish desires.
In fact, if the implication was indeed sexual, then it’s a huge sin to have your Pokémon use its power to disguise itself as a specific human and take advantage of it this way. It would be less hurtful if you wanted companionship with the Pokémon itself, no illusion whatsoever.