Claims of virgin births in the US near 1%
http://www.reuters.com/article/2013/12/17/us-usa-health-virgins-idUSBRE9BG1F020131217
Nearly 1 percent of young women in a U.S. study who have become pregnant claim to have done so as virgins, according to a report in the Christmas edition of Britain's BMJ medical journal.
The authors of "Like a virgin (mother)" - whose prose is devoid of irony - say such scientifically impossible claims show researchers must use care in interpreting self-reported behavior. Fallible memory, beliefs and wishes can cause people to err in what they tell scientists.