<prompt> For the following causes of sexual dysfunction, select the most likely clinical feature.Rarely indicates organic disease.loss of sexual desirefailure of erection with absent nocturnal penile tumescence NPTabsence of emissionabsence of orgasm with normal libido and erectile function  <response>: An absent orgasm, when libido and erectile function are normal, invariably indicates that organic disease is absent. Loss of desire can also be caused by psychologic disturbance, but may indicate androgen deficiency or drug effect. 