Likelihood of contracting HIV is almost non-existant. Saliva kills HIV, so unless you have an abrasion or cut on your mouth or tongue, there is ZERO chance. If you do have a cut, the possibility increases slightly.
As far as other STDs, I imagine the chances are similar between fellatio and cunnulingus. The only difference I can think of is that herpes sores are sometimes on the inside of the vagina, and I suppose there's a chance you might not notice them and hence have a higher chance of getting herpes.
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