The Journey of Lyons 449

Erectile dysfunction, or ED, is defined as the persistent or consistent inability, in any form, to achieve or maintain an erection (as opposed to voluntary inhibition or response to sexual stimulation; see also, ‘Impotence’), underlying the underlying medical condition. ED has been classified as vascular disease (which leaves open the possibility that there might be other primary explanations), neurologic disease, endocrine disease and psychosocial disease. ...