"Charming, charming," murmured the Director and, giving [Lenina] two or three little pats, received in exchange a rather deferential smile for himself. (1.93)
Huxley hints at the rampant promiscuity in this society even before we get to see the whole picture. As readers, we feel more and more uneasy as we go.
"Just to give you a general idea," he would explain to them. For of course some sort of general idea they must have, if they were to do their work intelligently—though as little of one, if they were to be good and happy members of society, as possible. For particulars, as every one knows, make for virtue and happiness; generalities are intellectually necessary evils. Not philosophers but fret-sawyers and stamp collectors compose the backbone of society. (1.5)
Much of the power the World State has over its citizens has to do with intellectual control. The Director's inclination that people should know only a little about the "general idea" is similar to Mustapha's later claim that thinking about purpose is a danger to society. Big thoughts lead to ideas of God, to philosophy, to questioning, to curiosity—all incompatible with blissful ignorance.
"My good boy!" The Director wheeled sharply round on him. "Can't you see? Can't you see?" He raised a hand; his expression was solemn. "Bokanovsky's Process is one of the major instruments of social stability!"
[…]
"Community, Identity, Stability." Grand words. "If we could bokanovskify indefinitely the whole problem would be solved." (1.18-21)
Science is used only insofar as it is a tool for control.