An evidence-based definition of lifelong premature ejaculation: report of the International Society for Sexual Medicine Ad Hoc Committee for the Definition of Premature Ejaculation.
McMahon CG, Althof S, Waldinger MD, Porst H, Dean J, Sharlip I, Adaikan PG, Becher E, Broderick GA, Buvat J, et al. BJU Int. 2008 Aug; 102(3):338-50. Epub 2008 May 21.