a disorder characterized by a persistent or recurrent inability to attain sexual arousal or to maintain arousal until the completion of a sexual activity.

characterized by a lack or absence of sexual fantasies and desire for sexual activity in a situation that would normally produce sexual arousal, or the inability to attain or maintain typical responses to sexual arousal.

(pathology) A spontaneous, persistent, and uncontrollable genital arousal, with or without orgasm or genital engorgement, unrelated to any feelings of sexual desire.