There are people working on that!!
http://biotechbinge.com/biotechnology/20...effective/
One shot, and no sperm! Hooray for biotechnology... Well maybe not all of it, but definately this! Drawback, I've heard it's a shot to the balls
As for IUD insertion, it's not as bad as having a baby. I'd rate it a 6 on a scale to 10 in terms of pain. Though I had unmedicated child births and thought it manageable.
http://biotechbinge.com/biotechnology/20...effective/
One shot, and no sperm! Hooray for biotechnology... Well maybe not all of it, but definately this! Drawback, I've heard it's a shot to the balls

As for IUD insertion, it's not as bad as having a baby. I'd rate it a 6 on a scale to 10 in terms of pain. Though I had unmedicated child births and thought it manageable.