Thanks everyone for your input! It's interesting that sperm can live for five days inside...I wonder if the timing/temperature thing addresses this?
Tractormomma I'd be interested in finding more out about that method, thanks for your reply!

problem is I live in Australia and it would be really expensive for you to send me the book even though it sounds great...any ideas where I could find out about it? Web address, was it on the web you could download a program?
Anyway..just realised that you said I could email you so I'll send this as an email to you!
Thanks heaps...
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Thanks, Charlie
[This message has been edited by Charlie_777 (edited 03-28-2001).]