What symptom best describes Erectile Disorder?

Erectile Disorder is primarily characterized by persistent difficulty in maintaining an erection during sexual activity. This symptom specifically targets the physiological aspect of sexual function, where individuals may find it challenging to sustain an erection sufficient for sexual intercourse. The condition emphasizes issues with the erectile function itself rather than other components of sexual experience, such as desire or orgasm.

The other options highlight different sexual dysfunctions. Inability to achieve orgasm pertains more to orgasmic disorders, while loss of sexual desire focuses on a decrease in libido rather than erectile function. Pain during sexual activity can indicate sexual pain disorders, which are separate from issues related to maintaining an erection. Therefore, the distinction of persistent difficulty in maintaining an erection captures the essence of Erectile Disorder accurately.