The verb נאף (adultery) only applies to a married woman (it comes from אף כי קנאה חמת גבר - For jealousy is the rage of a man⁷²⁵).

footnotes: ⁷²⁵ Proverbs 6:34.

And for the woman, the verb נאף and the verb זנה apply. נאף is with respect to copulation and זנה is with respect to inviting herself to be invalidated or to make herself available. And thus, with respect to the male, the verb זנה is never used anywhere; only with respect to involving himself with idol worship.

And there is a difference between נאף in simple conjugation and מנאף in intensive conjugation, in that מנאף means that one causes someone else to commit adultery.