as per title, want to have a go at a body slide but not sure what to expect.

From the forum info I could get there seems to be a lot of uncovered groin grinding, anything I should be mindful of as I'm not keen to catch any nasties. I know BS is inherently dangerous but want to minimize any exposure to STI's e.g. Could I ask the girl if i can inspect her body for any superficial signs, obviously she can have a look at mine as well beforehand etc. Or should I treat it as s FS and get covered up before the grinding begins?