you tried to post on your prior post on the experts forum and it was bumped over to here since too much time has passed.
just licking is very low risk for std's. we always recommend that if your pants are off, a condom should be on. it protects you and saves you worrying in case things go further than you thought they would!
grace
To ask a doctor you have to do a pay expert. Here is an open forum. Itys not an odd question and from what you describe there is not risk for contracting std's