[Maximilian]

This article is just as much a hit piece against NFP as it is a "science report" on the conclusions based on this study.

True, the reporting is biased. But the facts of the original study (which had nothing to do with the rhythmn method) seem pretty straightforward. The data about fraternal twins with different conception dates was fascinating.

[Polycarp]

The data about fraternal twins with different conception dates was fascinating.

Fascinating indeed, but the least credible claim in the entire article. I need a lot more evidence than this Reuters report to begin to give it credence.