All my experiences have been good ones. But I think Aqua's right, you can maximize your chances of a good time if you think hard before you do anything. You want to figure out how you feel about the experience. Actually spell out anything that makes you feel uncomfortable or nervous, and talk about those things with your friends. If you like the stories you've found on here, or like parts of them, they might be something to share. Start the conversation going.

Most of all, though....only do it if it's something you want. Not just becaue they seem to want it, or because you may not get as good a chance again. And one of the rules that ought to be in place is that anyone should be able to call a halt, at any time. If you just feel awkward, or uncomfortable, or put off by anything...everyone should know it's ok to call a halt.

There's always more to say on the subject , just shout out if you've got more question.

G