It seems like a silly question but I am having a hard time getting over it. I looked at the old Experts Forum (Hunt & Handsfield) and the risk of contracting HIV or an STD from having your rectum fingered is @ zero. I am a male and was engaged in Frottage with another male when he started to massage my rectum (my underwear was on) with his finger (he was masturbating prior). He eventually got a little rough and told him to stop and the encounter ended. I know the underwear was a barrier and his bare finger did not penetrate my rectum, but I need a little reassurance that this encounter was safe from contracting HIV or another STD or an STI. Because I have a female partner and we have unprotected sex.
Any advice would be appreciated.