SXMCNSex Machine, SEX★MACHINE, セックス★マシーン

The year is Showa 74 (1999 A.D.) and the world has been through much turmoil. The streets are littered with destitute buildings, crime, and also SexMachines... mechanical humans that can be used as motorcycles by thrusting a penis inside of them. These SexMachines have been in use since the olden days, however, when criminals began riding them, the police had to adapt, and began to use them as well. One of these officers is Suzuka Yoshimura, a rookie cop who doesn't play by the rules aided by the help of her SexMachine "Ace". She recently heard of an exhibition that will show off a so-called "Legendary SexMachine". What type of SexMachine is it, and what is it's goal?