Timing and Frequency of Intercourse:
You must deliver sperm no closer than 4 days before ovulation.
Girl sperm are like the tortoise in the Tortoise and the Hare children's fable:
I'm eager to see which of these tips will work for you.
Some women have longer or shorter cycles.
Theories and Myths Part 2:
Cycle lengths of more than 35 days are too long for appropriate calculations.