[Nathans_Dad]

First, I have not seen any information on this study being declared seriously flawed. I just did a quick Google search and also found nothing. Would be interested to read any link you might provide.

Second, if that is the case, then it makes the study more robust, wouldn't it?

If you take a man who is less likely to have multiple sex partners and show a benefit in virus transmission, that benefit would be expected to be at least the same if not greater in someone who was at higher risk.