it's rs2K or RoomService2000.  Since we are well into the computer age, I would suspect a real thorough background check might show up something.  But belonging to any of those sites is no more illegal than it is to be a paying member here.  You're not worried about this site showing up on a background check?  However, if it is of that much concern to you, I would forego it.  

Swim

That doesn't mean someone from the US can't hack into it, but it's pretty safe.

Then I waited a few years... and realized that with the way life goes the likelihood you're going to have one of those jobs goes down more and more. If I were to get a gov't spook job, it would have been right out of college.

I'd worry less about the fact that you have a membership, though. The alphabet agencies will polygraph you. I believe one of the questions (right after the pot and drugs one) is whether or not you've ever paid for sex. My suggestion is to go find a place to have p4p sex legally (ie: Nevada's brothels, out of the  country) so you might be able to get away with a half truth.

it's hard to see how it would come up, unless they put Echelon to work on one hell of a fishing expedition (and maybe you shouldn't rule that out). The sites identify you with only partial info in combination, such as your first name, last 4 digits of your DL#, etc. Of course, if the full info you give them initially to get verified were to get hacked or leaked, that would be another matter, whether they're in the US or not.

To lower your risk, if you've seen providers who are members who can vouch for you, you can join P411 or Date-Check without giving them full personal info. P411 requires two provider okays, D-C requires just one.