Pleasure Gelfs are, in their natural form, amorphous, green slimy blobs around 1.5 metres high. In this default form they have a single tentacle-like appendage with an eye on the end. At least one Pleasure GELF has resolved to finding a "cure" for its "condition". Pleasure GELFs are telepathic. They can sense whatever the people around them would be attracted to, and make them believe that this is what they're seeing. The Pleasure GELF named Camille took the form of a female Series 4000 GTi mechanoid when rescued from a wreck by Kryten. Unlike several other genetically engineered life forms, such as the manipulative polymorphs and the aggressive beastmen-GELFs, pleasure GELFs are actually benevolent and non-threatening. Some such as Camille will attempt to pass themselves off as humans (or holograms, mechanoids, etc.) but this is generally not an attempt to be manipulative, more akin to a camouflage reflex so other species won't try to harm them (though they can voluntarily stop the telepathic projection and reveal their true form if they need to).
Each of the Dwarfers saw their dream partners, and Camille was forced to reveal her true nature. Despite its natural form, Kryten began dating it. Camille eventually left to help her partner, a Pleasure GELF named Hector, in a manner similar to Casablanca.