[askmike]

in that case they wouldn't really test whether it works or not..

[sangnoir]

I don't think they were measuring the efficacy on the basis of whether or not the participants conceived - that measure is affected by too many variables. Sperm count is the more reliable metric with reasonable granularity for measuring the effect.

[tveita]

It's supposed to lower sperm count, which you could easily verify with a sample.