As long as you don't get caught, the best thing about having sex is that you can do it almost anywhere. It doesn't matter if you do it at home or in a public place where no one is likely to see you and your mate. The main reason you don't want anyone to find out is that being indecently uncovered is against the law in most places. A lot of these brave couples cross the line, even when they're just trying to have fun, though, because people who are open about their sexuality are more likely to try new things and see what works best for them.