1. Don't use any lubricants
Lubricants are designed to reduce friction between two surfaces, and they work great at doing just that. However, if you're using them to prevent yourself from getting hurt, then you're doing it wrong. Lubricants are meant to be used before penetration, not after. If you've ever had anal sex, you know how painful it can get. You'll need to take extra precautions to avoid hurting yourself, and lubricants won't help.
2. Don't go down on someone who's already been fucked
If you're going down on...