It still seems odd to worry about sinking before having a grasp of the fundamentals of how to sail. Statistically, dupek, you're very very very unlikely to sink any boat if you follow basic safety practices, understand how to read weather files and reports, know how to navigate, keep up with your boat maintenance, know how to sail, have good basic seamanship skills/practices, etc.... As we tap on our key boards, there are thousands of boats out sailing in the oceans and lakes of the world. Interestingly enough, reading about a sinking isn't something that happens much, even on sailing web forums. Personally, I think a monohull boat, while slower, is safer. If you flip a catamaran at sea, it might not sink, but you're really going to be in a lot of trouble. There are many ways to die on a boat even if it doesn't sink. In our area, the water is very cold. Hypothermia is what we're generally most worried about. Falling off the boat is a much more real danger than sinking. And like Mario says, conditions that pose a real threat to a mono hull can certainly flip or sink a cat as well. Again, IMHO, it seems you'd be much better off taking some dingy or beach cat sailing lessons than worrying about sinking either. If you can't swim, it's always a good time to learn.