HOME >> BIOLOGY >> NEWS
Nature's ambush: pregnancy more likely from single unprotected intercourse than believed

US research published (Thursday 10 June) in Europe's leading reproductive medicine journal Human Reproduction[1] suggests that a single act of unprotected intercourse is more likely to lead to an unwanted pregnancy than was previously believed.

In a study on women who had either been sterilised or were using an intrauterine device (IUD) the frequency of intercourse increased during the six most fertile days of the menstrual cycle and peaked at ovulation despite the fact that these women clearly did not want a baby.

The research team studied 68 sexually active women over three months (a total of 171 ovulatory cycles). The women kept diaries of days when intercourse occurred, and collected daily urine specimens. Researchers later used the samples to identify the fertile days in the cycles. Overall, intercourse was 24% more frequent during the fertile days than during the rest of the cycle.

Lead research Professor Allen Wilcox from the National Institute of Environmental Health Sciences in Durham, North Carolina, said: "There apparently are biological factors promoting intercourse during a woman's six fertile days, whether she wants a baby or not.

"It suggests that couples who 'take a chance' with unprotected intercourse have the deck stacked against them. Intercourse apparently does not happen randomly. It's more likely to occur on the fertile days, even though the average woman won't know when these days are. For whatever reasons (and we don't yet understand the biological reasons behind this) a woman who engages in a single act of unprotected intercourse is more likely to get pregnant than was previously believed."

He said: "It's not uncommon for a doctor to hear from an unhappily pregnant patient that she and her partner had taken a chance 'just this once'. It may be easy to dismiss such claims, but our data suggest these women are probably telling the truth."

Prof. Wilcox and his colleagues from the NIEHS
'"/>

Contact: Margaret Willson
m.willson@mwcommunications.org.uk
44-0-1536-772181
European Society for Human Reproduction and Embryology
9-Jun-2004


Page: 1 2 3

Related biology news :

1. Researchers discover structure of Natures circuit breaker
2. Natures own antidote to cocaine
3. Natures own medicine for vision loss: Inhibitor of angiogenesis found by biologists at The Scripps Research Institute
4. Natures chemical weapons save lives
5. Natures path leads scientists to new antibiotic strategy
6. Worlds Leading Echinacea Researchers To Examine Latest Scientific Findings On "Natures Gentle Antibiotic"
7. Natures Sugar High
8. Photosynthetic Harvest Inc. Harnesses The Power Of Natures Chemical Factories By "Milking" Green Plants For Valuable Natural Products
9. Coordinating power of circadian rhythms keeps estrus and pregnancy on track
10. Anxiety during pregnancy affects child behavior
11. Antioxidants during pregnancy may help prevent birth defects tied to alcohol

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:5/21/2020)... ... May 19, 2020 , ... ... operations management solutions, today introduced BioMed to their award-winning computerized maintenance management ... connecting the people and systems around biomedical engineering to better allocate staff ...
(Date:5/21/2020)... (PRWEB) , ... May 21, 2020 , ... ... care across the North Shore and Greater Boston area, is pleased to announce ... As one of the busiest group practices in the area, Agility Orthopedics is ...
(Date:5/14/2020)... ... May 13, 2020 , ... DuPont ... latest enzyme for the lactose-free dairy market. This unique product allows for process ... dairy products at competitive costs across North America. , Among the numerous benefits ...
Breaking Biology News(10 mins):
(Date:5/26/2020)... MENLO PARK, Calif. (PRWEB) , ... May 26, 2020 , ... ... Genie , the most recognized brand of smart garage door openers, announce a new ... full line of Wi-Fi enabled garage door openers powered by Aladdin Connect® can now ...
(Date:5/21/2020)... Prairie, MN (PRWEB) , ... May 19, 2020 , ... ... to help patients get dental implants and bone grafting through PIEZOSURGERY® technology. ... tissues. This is often used to prepare a patient for dental implants, especially when ...
(Date:5/21/2020)... REDWOOD CITY, Calif. (PRWEB) , ... May 20, ... ... to announce the addition of Simon Prakash, who will serve as the company’s ... Simon joins at a time when Exo is disrupting the medical imaging space, ...
(Date:5/15/2020)... ... May 14, 2020 , ... Children with defective heart ... before becoming adults. The reason: there are no heart valve prosthetics designed ... the Department of Defense has awarded Draper, Boston Children’s Hospital and Seattle Children’s ...
Breaking Biology Technology:
Cached News: