https://nwhyte.livejournal.com/3762027.html

The Primal Urge is both more approachable that Cryptozoic! and has aged much less well. The story is about the revolution in 1961 Britain caused when everyone of adult age installs lights in their forehead which glow if they are sexually attracted to the person they are speaking to. (The book was banned in Ireland.) A few foolish people resist the compulsory modification to their bodies, but the population as a whole embraces it, and soon, each other. The humour is not exactly subtle - one of the protagonist's love interests is called Rose English, and there is a psychiatrist called Dr Croolter B. Kind. It's a long way down the list of Aldiss's novels, perhaps an attempt to break into the mainstream by writing a contemporary comic novel with an sfnal twist, and for that reason has dated very badly; but it's clearly written and you know where you are. ( )