Protagonist is an older woman who takes some kind of pills to enhance her body and sex appeal. And the guys she has sex with will last 3 days until passing out as a result of the pills. The side effects of the pill is that everyone around her is affected as well and as a result, the whole town is contaminated with the "sex virus" and orgies are happening everywhere.
There's also a sub-story of her friend who took the pill to have sex with her granddaughter's boyfriend. Ring a bell?
There's also a sub-story of her friend who took the pill to have sex with her granddaughter's boyfriend. Ring a bell?