Interesting thought, this was something we did in MATHS @ SCHOOL. (weird i know). OK right, i cant remember the small details but....
A large section of people birthdays tend to be about 1 month (i 4got which), then you trace that back 9 months (or however long pregnancy lasts), and then you get to summer - most people have sex on holiday during the summer where they get pregnant.
:helpsmile: