I wonder how this would effect STD rates in areas with bad sex ed? I could see a lot of people thinking 'don't need a condom because I can't make someone pregnant now'. Not that this product is a bad thing, very useful for people in monogamous relationships.
I don't really see how this would be much different that the pill, though.
This smaller subset would be at higher risk of STDs if they adopt use of this contraceptive and stop condom use while still sleeping around. If the trend continued, the incidence of STDs would increase, which would change the risk factor of STDs, which would sway a subset back into condom use.
All is balance.