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For a 28 day cycle, you can have unprotected sex on 13th, 14th, 15th, 16th, 17th days to ensure sperm to fertilise your eggs. If your cycles are irregular, subtract 18 days from your shortest cycle and 10 days from your longest cycle and that is the period you can have sex, for example if your shortest cycle is 28 days and longest cycle is 32 days, then you can have sex between 10th and 24th day. This way sperm will reach the ovum as soon as ovulation takes place.
Answered: Sun, 10 Jul 2011
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