Re: FB Messenger - Private Effie, Kitty
Well the first thing is to make sure you're comfortable with whatever's happening. If you get scared or it doesn't feel right, a good rule of safety is knowing you'd like to stop there and give yourself some time.
Outside of that, to be blunt, it's using protection to avoid pregnancy and STDs. I don't think you'll have to worry about the latter, but it's always good to be smart. It doesn't hurt to have a working knowledge of how sex is done. Think of it like a biology lesson.