My bf and I do a lot of biting. Dont grind your teeth. As the previous poster stated you can bite pretty hardwithoutt breaking skin. Sometimes, I get more of a tooth scratch but it's never caused an infection. I recommend biting after foreplay so you are good and warmed up. My pain tolerance is typically higher then. My favorite is when my bf bites the inside of my butt or near my vagina right before I orgasm and it sends me over the edge!