Waldinger MD, Quinn P, Dilleen M, Mundayat R, Schweitzer DH, Boolell M. A multinational population survey of intravaginal ejaculation latency time. Journal of Sexual Medicine. 2005, 2 (4): 492–7. PMID 16422843. doi:10.1111/j.1743-6109.2005.00070.x.
Corty, E. W.; Guardiani, J. M. Canadian and American Sex Therapists' Perceptions of Normal and Abnormal Ejaculatory Latencies: How Long Should Intercourse Last?. The Journal of Sexual Medicine. 2008, 5 (5): 1251–1256. PMID 18331255. doi:10.1111/j.1743-6109.2008.00797.x.
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Waldinger MD, Quinn P, Dilleen M, Mundayat R, Schweitzer DH, Boolell M. A multinational population survey of intravaginal ejaculation latency time. Journal of Sexual Medicine. 2005, 2 (4): 492–7. PMID 16422843. doi:10.1111/j.1743-6109.2005.00070.x.
Corty, E. W.; Guardiani, J. M. Canadian and American Sex Therapists' Perceptions of Normal and Abnormal Ejaculatory Latencies: How Long Should Intercourse Last?. The Journal of Sexual Medicine. 2008, 5 (5): 1251–1256. PMID 18331255. doi:10.1111/j.1743-6109.2008.00797.x.