Flirting with any member of the opposite sex aged 16-100
Watching enough porn to mentally corrupt Satan
Breaking off, mid sentence, to stare at an extremely unimpressive person
Suddenly considering hoody wearing chavs to be sexy
Shocking outbursts of temper and/or crying
Muttering "I would!" after every mildly attractive person passes
Acting like a hyperactive, oversexed teen every time a genuinely attractive person comes into view.
Treatment involves either;
A group of generous friends willing to pay for a prostitute.
A REALLY generous friend of the opposite sex,
Sex with a totally horrifying person, (Which ususally leads to immediate self diagnosis of HES as soon as the act is complete)
Wanking oneself into a coma.