But, I get the appeal. Men taking on some of the responsibility and hormones that have historically been the sole responsibility of women is pretty rad. A lot of oral and injected birth controls have been shown to cause nasty side effects on women, including lower sex drive, vaginal dryness, and weight gain. So sharing the burden would certainly be welcomed!
But it's not a perfect solution, either
There were a few drawbacks found in the study.
Of the 207 men given birth-control injections, eight had sperm counts that failed to return to normal after the study was complete. And a rather large percentage saw noticeable side effects -- mostly notably, mood disorders. The study stopped taking on new participants in 2011 and researchers are looking for new methods of delivery, such as gels, which will hopefully alleviate the side effects seen with the injections.
So, while there certainly is hope for a new dawn for contraceptives... we still have work to do.