Okay, so I've just come back from a happy ending massage and am having some worries that I had not had beforehand. In short she masturbated me with her and and quite vigorously used her finger to stimulate my anus while I groped her breast. I'm concerned that it may be possible to contract an std from this since I'm sure she does the same thing to many guys a day. My main concern comes from the anal stimulation in that maybe she had some virus/bacteria on her hand from a previous guy and get fingernail may have rubbed the tissue opened and infected me with an std/sti. Is this at all possible? Am I at risk for any std's/sti's from anything that was done?