Excerpt from: "On the nympho race", by Citizen Grey
Nymphos are a strictly female race genetically engineered by Humans, and are therefore unable to self-reproduce. The Nympho race began appearing in remote locations across the galaxy (usually mining settlements primarily inhabited by male Humans) in the standard year 2463 A.D. It is not clear which corporation "invented" the Nympho technology, but the genetic code was pirated and soon sold across the galaxy. The primary purpose of the Nympho presence at mining settlements was to attract workers (over 60% of whom were male Humans) and keep them peacefully occupied during non-working times.
The genetic engineers hoped to enforce their virtual slavery by designing them to be extremely dim in intelligence and wisdom. Even so, by the standard year 2510 A.D., Nymphos obtained legal protection allowing them to be self-determined. Today, Nymphos are regarded as contracted labor rather than slaves, and can obtain social and political status.
Nymphos are genetically engineered to have above-average sight in dim conditions (ie: clubs and pub backrooms), as well as superior dexterity. Typically, they are considerably shorter and lighter than their Human male counterparts. Nymphos are also designed to be extremely attractive, and usually spend over 70% of their wages on maintaining their appearance. As a result, they often receive outrageously high wages, even in occupations hindered by their low physical strength or intelligence.