STD’s

Patient: My friend tommy told me he fingered a girl and with that same hand he masturbated. if she had some kind of std could he have cought it himself from fingering her then masturbating with the same hand? he told me that it was dry. There was no kind of wet fluids or anything on his hand when fingering her or masturbating himself.I know this is an odd and probably innapropriate question, but if you can please anwser, it would be greatly appreciated.

Doctor: