Premature and delayed ejaculation: genetic and environmental effects in a population-based sample of Finnish twins.
Jern P, Santtila P, Witting K, Alanko K, Harlaar N, Johansson A, von der Pahlen B, Varjonen M, Vikstr?m N, Algars M, Sandnabba K. Premature and delayed ejaculation: genetic and environmental effects in a population-based sample of Finnish twins. J Sex Med. 2007 Nov; 4(6):1739-49.