Older men told to 'use it or lose it'

Other factors that contribute to erectile dysfunction that were taken into account include include age diabetes, and heart disease. Blood is retained by a muscle that stops blood from being returned to the body during arousal. Perhaps without regular exercise it is more inclined to lose its grip on the blood vessels.
How being caught by surprise affected function, was not mentioned

clipped from www.abc.net.au There's new advice for older men who want to preserve their sexual function: have sex, and have it often, The study, published in the American Journal of Medicine, followed nearly 1000 older Finnish men for five years, and reports that those who were regularly having sex at the start of the study were at lower risk of developing erectile dysfunction (ED) Dr Juha Koskimaki and colleagues at the University of Tampere in Finland studied 989 men who were between the ages of 55 and 75 8% of men who had reported having sexual intercourse less than once per week had ED 3.2% of men who had intercourse once per week ED among men having sexual intercourse three or more times per week was 1.6%. ED occurs when there are problems with blood flow to the penis. Regular sexual activity may help maintain healthy blood vessel function in the erectile tissue. A number of factors contribute to ED development after taking account of those factors, sexual activity itself remained linked to ED risk