Synopsis by Mark Deming
An innocent country girl is introduced to several varieties of big-city corruption in this wild sexploitation feature shot in Texas. Diane (Diane Darcel) is an attractive young woman who has just turned 21, making her practically over-the-hill in the eyes of her degenerate stepfather. Stepdad arranges for Diane to marry Rick Edwards, a good-looking and well-to-do local boy, in exchange for "lending" him 50 dollars (he opts not to tell Rick when the bridegroom accidentally forks over an extra 20 bucks). While Diane isn't at all happy about the situation, she goes along with the bargain, but when the dawn breaks after her wedding night she discovers Rick has abandoned her at the sleazy motel where they were staying. Diane is "befriended" by Michelle, a drug-addicted lesbian who is running a prostitution ring out of the motel, and she attempts to turn Diane out until Michelle's luck takes a turn for the worst. Left to her own devices, Diane maps out a plan to rob 15,000 dollars from crime boss Al Hoffman, but her life of crime turns out to be a dead end. Hip, Hot and 21 also features a guest appearance from Lorna Maitland (star of Russ Meyer's Lorna) as a well-endowed exotic dancer.