Other companies focus more specifically on the brain connection to arousal disorder.

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"We started to look into the brain to see what was happening and found that during those periods of arousal, the 'habit' regions in the brain were activated, " Sinha says.

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PT-141 (short for Palatin Technologies) works very differently: It interacts with melanocortin receptors in the brain, nerves involved in sexual arousal.

FORBES: A novel way, perhaps, to treat sexual dysfunction.

PT-141 (short for Palatin Technologies) works very differently: It interacts with melanocortin receptors in the brain, nerves involved in everything from regulating appetite to sexual arousal.

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The compound may help desire and arousal disorders in postmenopausal women, perhaps by stimulating estrogen receptors at sites in the body, including the brain, says Michael Diamond, an obstetrician and gynecologist at Wayne State University.

FORBES: Quest for Desire