We have tested methods of birth control for women. We have untested and/or not as effective and/or not as safe methods for men. These methods also alter your hormones, the testicles are where the male hormones are produced. (We also have condoms guys)
The "important problem" should be to have _even safer_ birth control, not male birth control.
The "important problem" should be to have _even safer_ birth control, not male birth control.