Nude male with clothed females in London, England.
Clothed female, naked (or nude) male (on the internet sometimes abbreviated to CFNM) is a genre of erotica featuring one or more nude men and one or more clothed women. It is sometimes described as a sexual fantasy, by women or men, depicting such a exhibitionist or physique worship scenario. One-sided male nudity can also arise when a male disrobes for the sexual pleasure of a woman or other women, such as in a BDSM and/or sexual activity, as an indication of sexual submission, or as part of a male striptease. The objective of this type of scenario is that the male is denied the sexual pleasure of seeing the women in the same state of undress, and is not in a position to dominate the scene.
One-sided male nudity is also considered by some to be a form of sexual objectification of men or as a role reversal, whereby the male assumes the subservient sex role. Some people regard such depictions to be pornography.
The opposite is clothed male, naked female (CMNF). There is CMNM (clothed male, naked male) and CFNF (clothed female, naked female), pertaining to gay men and lesbians respectively.
There are several sexual and nonsexual erotic scenarios which involve one-sided male nudity. These may involve female domination, male submission, exhibitionism and erotic entertainment. A combination of all categories is somewhat rare, although several web sites cater to the sub genres separately.
Although only given the name CFNM upon the birth of the internet, the concept of CFNM has been a fetish common for many men and women for decades. Commonly devotees believed they were alone in their interest until the internet brought them together. (citation - Visual Sensations for Women, The Femdom Forum).
 Portrayal of male nudity
Perseus and Andromeda, a wall painting from Pompeii
In classical antiquity, the portrayal of nude male form in art (including the exposure of genitals) was considered to be more acceptable than that of the naked female form. This can be seen in the comparative portrayal of the classical theme of Perseus and Andromeda. In a wall painting of ancient Pompeii, Perseus is nude while Andromeda is fully clothed.
By the renaissance, this view had reversed. For example, in Titian's treatment of Perseus and Andromeda in mid-1550s, however, it is Andromeda who is nude - save for the barest wisp of fabric - while Perseus is clothed in armour.
In many western countries women's breasts are now commonly exposed and depicted without scandal. Although male nudity is becoming more widely accepted in various contexts, it is arguably the case that female nudity still remains less controversial than male nudity. Paradoxically, partial nudity (including toplessness) of males in public is often looked upon as less shameful in many cultures.
 CFNM fantasy and humiliation/punishment
Unlike CMNF, CFNM is not divided into categories Nice CFNM and Hard CFNM. There are many reasons why the male participants receive pleasure from the CFNM experience. Many males enjoy being completely nude around females and do not tend to be disappointed that the females are fully clothed while experiencing the sexual pleasure given by females including masturbation. While the male figures in CMNF are almost fully clothed, the females in CFNM often are seen in only their undergarments.
However some male participants often feel humiliated during the experience. Like the females in Hard CMNF, the focus is on the embarrassment/humiliation he experiences in the situation.
 CFNM in film
Porky's Revenge (1985) has a scene in which the boys' basketball team is tricked into thinking that they were going to have an orgy with the cheerleaders. Before they jump into the pool the boys strip down to their boxers and the girls to their swimsuits. Then the girls trick the boys into taking off their boxers while the girls throw a different swimsuit that came from a bag that they passed around so they could keep their suits on. When the boys approach the girls, the girls raced to the deep end and made the boys get out without their suits, and the girls filmed them.
In Exit to Eden (1994) Lisa Emerson (Dana Delany) who is dressed in a red negligee, ties up the arms of a nude Elliot Slater (Paul Mercurio) to a frame. Then she fondles his upper body, appreciatively pinches and squeezes his buttocks and spanks him.
 See also