Horse breed been produced. Such restrictions have led to legal challenges in the United States, sometime based on state law and sometimes based on antitrust laws. Horses can crossbreed with other equine species to produce hybrids. These hybrid types are not breeds, but they resemble breeds in that crosses between certain horse breeds and other equine species produce characteristic offspring. The most common hybrid is the mule, a cross between a "jack" (male donkey) and a mare. A related hybrid, the hinny, is a cross between a stallion and a jenny (female donkey). Most other hybrids involve the zebra (see Zebroid). With
Clothed female, naked male exchange where the more traditionally dominant male is objectified, debased, or humiliated by a more traditionally submissive female. As a result, CFNM fiction frequently includes the clothed female taking on the role of a dominatrix over the nude male. The opposite of CFNM is clothed male, naked female (CMNF). 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. By the renaissance, this view had reversed. For example, in Titian's "treatment of Perseus and Andromeda" in the mid-1550s, it is Andromeda