The statistics show that there is a statistically significant decrease in the chance of pregnancies following forcible rape. There is no way to scientifically determine the exact explanation. The fact is that events like this can cause significant hormonal imbalances in women as with any serious traumatic event. This could be the explanation. Another explanation could be prayer. The fact is that there is statistical evidence to show an anomaly. Akin's theory to explain that anomaly is as valid as anyone else's.
P-M, would you please post a link to the stats showing the anomaly. Statistics showing Akin's point pretty well puts Akin in the clear. As you say, you can't "stage a violent rape" to see what happens in a woman's body.
The stats were pretty easy to locate on google just a day or two ago, but now when you try to search for that documentation all you get are links to news and blog stories about Akin.
Those stats have been on pro life websites for years.