Kammerer-Doak, Dorothy; Rogers, Rebecca G. (2008). „Female Sexual Function and Dysfunction”. Obstetrics and Gynecology Clinics of North America. 35 (2): 169—183. PMID18486835. doi:10.1016/j.ogc.2008.03.006. „Most women report the inability to achieve orgasm with vaginal intercourse and require direct clitoral stimulation ... About 20% have coital climaxes...”
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"The amount of time of sexual arousal needed to reach orgasm is variable – and usually much longer – in women than in men; thus, only 20–30% of women attain a coital climax. b. Many women (70–80%) require manual clitoral stimulation..." Joseph A. Flaherty; John Marcell Davis; Janicak, Philip G. (1993). Psychiatry: Diagnosis & therapy. A Lange clinical manual. Appleton & Lange (Original from Northwestern University). стр. 544 pages. ISBN978-0-8385-1267-8. Приступљено 5. 1. 2012.
Kammerer-Doak, Dorothy; Rogers, Rebecca G. (2008). „Female Sexual Function and Dysfunction”. Obstetrics and Gynecology Clinics of North America. 35 (2): 169—183. PMID18486835. doi:10.1016/j.ogc.2008.03.006. „Most women report the inability to achieve orgasm with vaginal intercourse and require direct clitoral stimulation ... About 20% have coital climaxes...”
Kammerer-Doak, Dorothy; Rogers, Rebecca G. (2008). „Female Sexual Function and Dysfunction”. Obstetrics and Gynecology Clinics of North America. 35 (2): 169—183. PMID18486835. doi:10.1016/j.ogc.2008.03.006. „Most women report the inability to achieve orgasm with vaginal intercourse and require direct clitoral stimulation ... About 20% have coital climaxes...”