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I have a feeling though that the woman's orgasm might help because during orgasm the woman's cervix tends to reach down and "dunk" into the pool of semen nearby. Many years ago I saw a science program showing this in action(!)
Other than that, I often wondered whether the rear entry position would be the most beneficial for pregnancy as the cervix is in a low position. But apparently it makes no difference. Personally all I can report is that both of our children were conceived in the missionary position...