Clothed women-naked men. Erotic games or a preference for scenarios in which (frequently narcissistic, exhibitionist and/or submissive men) strip for women or a woman who remains clothed. Further acts, sexual or role play may ensue, but are not essential to the cwnm scenario. (Sometimes because the one or more participants' sexual preferences may not be heterosexual, eg "women in control") The erotic charge essentially comes from observing or being observed and admired - a variant of voyeurism
Male stripper at a hen-party, or a man offering light domestic services free, on condition that he performs them naked for an admiring woman.
There are a number of illustrative websites listed under the cwnm acronym, but should be opened with caution - insecure.