If you feel the need to put something down on paper, start with the basic stuff.
Make her promise to always be safe. Perhaps letting you know via text or call where she is and the like.
I again apologize if I'm preaching, but the world today.....people just can't be safe enough.
It's possible she may be looking for you to set some boundaries, such as the number of men at one time, or how often she meet(s) with her lover(s); anything along those lines. If you have any qualms about anything, it's your chance to speak up.
If you don't, say that too.