Hi Nilo and thanks for your comments!
I would agree that in school we are lead to believe that simply holding hands with a boy can lead to pregnancy! lol
Unfortunatly this isn't the case, if I weren't the control freak that I am I would follow everyones advice and let it happen naturally! They recommend BD every 2-3 days.
However if you want to know a bit of what I have learnt then read on!
The hormone estrogen builds up and around day 14 of your cycle (this will change depending on the length of your cycle) you will ovulate. Your egg will only 'live' for 6-12 hours. Sperm can live for upto 3-5 days. However even if the sperm and the egg are in the same place at the same time there is only a 20% chance of it leading to pregnancy.
They say that 90% of women will get pregnant within a year of trying.
It is just the luck of the draw.