As of yet, there has been no widely available contraceptive that is specific to only men, other than getting a vasectomy or wearing a condom, but scientists have made breakthroughs in one that they're calling 'Vasalgel.'
Vasalgel is a male contraceptive that works by being injected into the vas deferens and is a reversible and less invasive method of halting fertility than a vasectomy would be. When men would like to have a child, they are able to flush out the polymer gel with another injection. Vasalgel is not yet available on the market, but it has been highly successful in halting fertility in trials, where it is being tested on monkeys.
This important innovation has many implications, providing men with more reasonable choices in their ability to reproduce or prevent pregnancy, and relieving some of the pressure from women who tend to be held entirely responsible when it comes to preventing pregnancy.