Huxley's state eagerly rewards pursuing sex without commitment--characters like Lenina find it unthinkable that someone would require exclusivity or permanence before sex. But the heroes of the work are Bernard Marx and the Savage, two characters who find Lenina's view of sexuality disturbing. Marx, for instance, wishes she wouldn't consider herself just "another piece of meat." The Savage, too, finds Lenina's view inhumane--he consistently constrasts her lack of sexual restraint with the love of Shakespearean characters.
Huxley's cautioning of a sexuality removed from permanent and exclusive commitments in marriage is articulate and insightful. Brave New World is certainly worth a read (or a re-read) when you get a chance.