You're just as likely to catch an std from either of those as you are with real sex. If she's infected, then she can pass it to you. You should always use protection unless you are in a monagamous relationship and have both been tested and came back negative.

Daile

Intact skin has less risk,but the more frequent the occurrance,the more your risk goes up.Rimming probably has more risk for the rimmer than the rimmee.It is not a good idea to engage in unprotected sex if you are not both monogamous and have tested negative for std's.Patty

If you want to rim, make sure your clean. Even up inside your anus, make sure your clean.