You've been a member since 2002 and you're asking about deposits even though there are endless threads about it. Do a search on deposits. And anon1 gave the best and only answer...Don't.
Or if you do make sure it's with a well established AND well reviewed escort. Ideally one who publicly interacts with the community (here or wherever). For every inch you move away from the above the risks go up exponentially.
Depending on what you have at stake, or how prone you are to getting ripped off, never doing deposits is a perfectly valid choice.