There will always be risk.
[QUOTE=EddieIL;5030904]most important thing that I'm worried is how do I know if girl is clean and risk free[/QUOTE]You should be fine if you don't kiss, and always cover it up.
Do your due diligence before you contact someone. This includes reverse image searches, google searches, and searching this forum. Most people who report on girls here have actually seen them, and you can PM people that seem to provide reliable reports for more information. For your first time, my suggestion is to find a girl that has been reviewed here a lot so you don't have to worry about if the girl is real.
For girls you find on your own, if it seems too good to be true, then it often is. Also keep in mind that any information you send to an agency or girl will likely be saved by them forever.