There are several more studies. That was just the one I was mentioning because it relates to serious health concerns for pregnant women.

For men, perhaps less of an issue, but I'm just generally in favor of keeping fecal matter as localized as possible and cleaning myself regularly. I would never take a shower where the shower head sprays up from the floor, you know what I mean? I wash top down, paying special attention to the stinky and the dirty areas, and I clean myself with the idea that everything I'm washing off is going down, into the drain. Not up, back onto my body.