References
- Cooper, T.G., Noonan, E., von Eckaedstein, S., Auger, J., Baker, H.W.G., Behre, H.M., et al (2010). World Health Organisation reference values for human semen characteristics. Human Reproduction Update, 16, 231–245.
- Craig, S. & Hepburn, S. (1982). The effectiveness of barrier methods of contraception with and without spermicide. Contraception, 26, 347–359.
- Finger, W.R. (1996). Contraceptive update: withdrawal popular in some cultures. Network, 17, 15–16, 24.
- Ilaria, G., Jacobs, J.L., Polsky, B., Koll, B., Baron, P. Maclow, C., et al (1992). Detection of HIV-1 DNA sequences in pre-ejaculatory fluid. Lancet, 340, 1469.
- Lader, D. (2009). Contraception and sexual health 2008/09. Office for National Statistics, Available from: http://www.statistics.gov.uk/downloads/theme_health/contra2008-9.pdf
- Masters, W.H. & Johnson, V.E. (1966). Human sexual response. Boston, MA: Little, Brown and Company, Pages 211.
- Mosher, W.D. & Jones, J. (2010). Use of contraception in the United States: 1982–2008. National Center for Health Statistics. Vital Health Statistics, 23 (29). Tables 1, 12 and 14. Available from http://www.cdc.gov/NCHS/data/series/sr_23/sr23_029.pdf [accessed 1 June 2010].
- NHS choices website “Is it possible to get pregnant without penetration?” Available from: http://www.nhs.uk/chq/Pages/975.aspx [accessed 20 April 2010].
- NHS Clinical Knowledge Summaries (2010). Condoms – male and female – your guide (fpa). Available from: http://www.cks.nhs.uk/Media/50_-12920_200.png [accessed 2 May 2010].
- Pudney, J., Oneta, M., Mayer, K., Seage, G., & Anderson, D. (1992). Pre-ejaculatory fluid as a potential vector for sexual transmission of HIV-1. Lancet, 340, 1470.
- Rogow, D. & Horowitz, S. (1995). Withdrawal: a review of the literature and an agenda for research. Studies in Family Planning, 26, 140–153.
- Withdrawal Method. Planned parenthood. March 2004. Available from: http://www.plannedparenthood.com/health-topics/birth-control/withdrawal-pull-out-method-4218.htm [accessed 20 April 2010].
- World Health Organization. (2010). WHO laboratory manual for the examination and processing of human semen. 5th ed, Geneva: ISBN 978 92 4 154778 9.
- Zuckerman, Z., Weiss, D.B., & Orvieto, R. (2003). Does preejaculatory penile secretion originating from Cowper's gland contain sperm? Journal of Assisted Reproduction and Genetics, 20, 157–159.