Right, I have no idea what I'm talking about because you personally think the merck researchers should have been in there measuring dicks. The definition of erectile disfunction is the inability to get or maintain an erection, so why would the researchers be doing some dick measuring and watching hard-ons with a stop watch instead of just asking for the most obvious markers which would be self reported instances of sexual dysfunction.
"Scientific manner"
you're a joke bud. Find me a general study (ie not viagara or an erection drug) on the planet that is measuring dicks to determine sexual impairment. Better yet, find me a "side" outside of blood pressure or a blood metric that is determined without self reporting in a clinical trial.