Caryl Churchill 
Cloud Nine (NHB Modern Plays) [EPUB ebook] 

A landmark play about sexual politics in colonial Africa and modern-day Britain, in which all our assumptions about sex and gender are stunningly exploded. First staged by Joint Stock and premiered in London at the Royal Court Theatre in 1979, it has since been staged all over the world.
Set in both colonial Africa and modern-day Britain, Cloud Nine is about relationships — between women and men, men and men, women and women. It is about sex, work, mothers, Africa, power, children, grandmothers, politics, and money.
'Sharp comedy and a serious purpose are splendidly combined… It unlocks the imagination, liberates the mind, and leaves you weak with laughter' Time Out