Yes I know, the theories all seem to refute each other. I do know that in the NZ study, they were told to only BD once in the month so that might make a difference? The general theory of male sperm live for 3 days and female sperm for 5 days may not be true at all. It may actually be that male sperm die in a more acidic environment, which is what you are usually dealing with 3-7 days before O. So if you are doing things to make yourself more alkaline overall, then maybe those little boy swimmers can live for longer than 3 days? SO I think what Shettles is actually saying is that that is the general rule, but it can be changed with diet. I have come to the conclusion that the diet/supplements is more important than the cut-off. We kept sperm count low by BDing every day and I took cranberry to try to make the environment more acidic, but didn't do the cut off - hoping that those things would circumvent the general rule. This theory also fits in with the O+12 theory, bc almost immediately after O the drop in estrogen causes CM to become thicker and more acidic, that's apparently why more girls are conceived 12 hrs after O. So, if we move forward on that basis, change your environment to either alkaline or acidic and BD when you can and should be enough to sway the odds (I think!!).

