There are several -Genuine- treatments (read: Aphrodisiacs) in trials right now.
The main promising one right now is PT-141 (Bremelanotide)
The main downside is it must be injected which will skeeve a lot of women out. It does work on men AND women though.
From their site: " In a recently completed Phase 2B clinical trial, bremelanotide 1.25 mg and 1.75 mg doses significantly increased sexual arousal, sexual desire and the number of sexually satisfying events, and decreased associated distress in premenopausal women with FSD. Efficacy was seen in both women with hypoactive sexual desire disorder (HSDD) and combined HSDD/female sexual arousal disorder (FSAD)."
Since it is currently just in trails and unscheduled, you can order it right now from research peptide sites.
Let's say a friend's wife has tried it, and she was as horny as a 18 year old boy for about 2-3 days. It is genuine arousal, not some blood flow modifier etc like Viagra.