Female sexual interest and arousal disorder

A 28-year-old woman comes to the clinic because of decreased sexual desire for the past year. She has been happily married to her husband for the past 5 years, but this is now causing significant relationship distress. She says that her libido used to be stronger, but now she has no desire for sexual relations and is unable to become sufficiently aroused when she attempts to. She is an artist and a stay-at-home mother to her two healthy children. Her medical history is noncontributory. She takes no medications. She drinks one glass of wine each weekend night, and denies tobacco or recreational drug use. Her temperature is 37.0°C (98.6°F), pulse is 70/min, respirations are 10/min, and blood pressure is 118/80 mm Hg. Physical examination shows a well-appearing young female in no apparent distress. Extensive laboratory studies show no abnormalities. Which of the following is the most likely diagnosis?