I admit, my knowledge of Mayer's work is rather limited, so this plot owes more to Lucas. So, here's my (somewhat disjointed) idea for the plot (subject to revision)...
So, it's the '70s, in a place called Gaffa County, somewhere in West Texas. Since the turn of the Century, Gaffa's biggest landowner and employer was the Republic Company, which despite it's size and influence remained a totally family owned business. It was not, however, the County's most notable institution. That honor goes to two competing brothels. One, Jade's, was a classy place, staffed by well-treated girls who were gorgeous, skilled, and loved their work. The other, Sissy's, was an industrial meat market, the girls practically enslaved by their greedy, sadistic Madame; it was, however, much cheaper. When the original Sissy died, her equally greedy and sadistic daughters took over. Eventually, the infighting between them, and between THEIR daughters ensured that they simply couldn't compete with Jade's anymore.
In the '50s, Republic was owned by one Paddy Emdale, a young, idealistic fellow who, like just about everyone in Gaffa County, was a frequent customer at Jade's. Unlike most customers, however, he fell in love with one of the girls, a talented new recruit named Annie Skye. Annie loved him back, but even in Gaffa County, societal conventions hindered their relationship. In order to facilitate their romance, Paddy and Annie relied on his secretary, Paula Patine. What neither of them knew was that Paula's grandmother had been one of the owners of Sissy's, and that Paula had secretly dedicated herself to avenging the family's downfall. She subverted Annie's loyalty, and orchestrated a series of events that forced the closure of Jade's...whereupon she opened the Empress, a brothel run along the same lines as Sissy's. When Paddy realized that his lover was responsible for this tragedy, he lost his mind, and had to be committed; with no clear heir, control over Republic ended up in the courts...which through bribery and blackmail Paula had placed under her control...
Which brings us to "today" (IE, the '70s), where Paula's Amazonian enforcer Darla Vade and her gang are cruising through a town and lay odds on the curvaceous Lucy Skye and her hunky-but-dimwitted twin brother Leo. Immediately, Darla resolves to recruit the beautiful young Lucy into her gang. When her initial offer is rebuffed, she and her shapely minions **69** Leo. In order to rescue him, Lucy and the twins' guardian Ole Betty Kentworthy recruit the all girl band the Milky Way Falcons; the quick-witted Hannah "Guitar" Solo, the towering Cibetta, and the smooth-talking Lanna Calhoun. Together they set out to rescue Leo, and succeed. Along the way, Lucy and Leo learn that Betty used to be one of the top girls at Jade's, that they are, in fact the children of Paddy Emdale and Annie Skye, and that Betty has deliberately been hiding them from Paula Patine.
In the end, Lucy and Betty head back to the farm, where Lucy begins her training in the secrets of **31**, while Leo goes on the road with the Falcons. Unfortunately, Darla Vade comes after them, released from prison by her boss' influence. Lanna cuts a deal with Paula's enforcer, which allows them to once again be captured, but after experiencing a change of heart she and Lucy manage to break out Leo and Cibetta; Hannah, however, has been turned over to Jenny Bahutt, a female nightclub owner/crime boss that Hannah had manged to piss off awhile back. Fortunately, she proves unable to stand up to Leo's manly charms, and agrees to release her captive in exchange for sex. Having established that they will never be safe from Darla so long as her boss rules Gaffa County. In the end, the twins manage to fuck them both into submission. Leo marries Hannah, and together they set out to restore the Republic company, while Lucy opens a new version of Jade's.