OK, I'll take this on. Basically, there is not much risk for HIV and other STD's for what you are doing with the one exception of Herpes. Herperes is one of the most common STD's and is easily contracted. At first, embarrassing, it is easily controlled by good medication that you only have to take at the first sign of an outbreak and since that would be around your mouth and lips, it should be easily seen. Nothing to be ashamed about, it is quite common. Look, you probably aren't infected unless she had an outbreak at the time you went down on her, so don't sweat it either way. Besides, it's much safer than other things you could have done! Good luck, Alan.