No joke!!! (CNN) -- Bill Gates is putting out a call to inventors, but he's not looking for software, or the latest high-tech gadget. This time he's in search of a better condom.On its Grand Challenges website, the Bill and Melinda Gates Foundation is offering a $100,000 startup grant to the person who designs "the next generation condom that significantly preserves or enhances pleasure" and promotes "regular use."It may sound like the setup for a joke, but the goal is deadly serious. While researchers call condoms one of the best ways to stop the spread of HIV, the virus that causes AIDS, getting people to use them is another story.The foundation wants to see something that will lead men and women outside of a committed relationship to stop and think twice before having unprotected sex. The startup grant could lead to $1 million in further funding."Male condoms are cheap, easy to manufacture, easy to distribute, and available globally, including in resource-poor settings, through numerous well-developed distribution channels," the foundation says. Nevertheless, many people are reluctant to use them because they complain that prophylactics interfere with pleasure and intimacy. This creates "a trade-off that many men find unacceptable," the foundation notes.