The exact is unknown but it has been linked to hormones released during puberty or pregnancy and certain types of medication.
Thousands of women are believed to have been sex workers during the conflict.
We had gone sightseeing for the day.
Other prostitutes would linger outside,.
By doing the daring shoot the squad hopes that they will raise the profile of the Hitchin Ladies rugby team pictured, a snap from last year's calendar 'Our club is a lot of fun and we like to play good rugby - hopefully people looking at the calendar will see that we like to have fun.
Dr Makepeace also discovered just how far the class divide stretched.
Epstein took this picture of me.