My hesitation with this kind of contraception is the interruption of sperm production, and the hopeful return of full fertility "in a few weeks." They need to do some trials. Test the sperm count of subjects prior to use of the drug, test during use of the drug to establish that production has ceased, then test after cessation of use and see how long it takes to regain full fertility (established by test results prior to use). I need to know for sure that my gun will reload! The other issue is yes, you may be free to raw dog without the threat of unwanted kids, but the STD threat is ever present.
"The best kind of pride is that which compels a man to do his best when no one is watching."