Stand On Zanzibar, which I love but is really horribly sexist. The young women who I think are said to be 'on the circuit' who move in with men in return for sex with both the original man and their room mate. And the otherwise mostly sympathetic white researcher feels able to complain to his black room mate about said room mate's preference for white women.

It's the only Brunner I've reread since I was a teenager and it put me off reading any more. A classic case of women not being actual people.