It says in this article that as it is now, you only have between a 1:100 - 1:200 chance of catching Aids even if you have sex with an infected person. Pretty good odds there.
Haha, yeah it depends on how you define good odds. Those odds would be good in Vegas. The odds of hitting the big jackpot on a slot machine are at least 1:262,144, usually worse. ;-D