Ok is anyone here missing the obvious, the lining of the urethra is a mucus membrane, Pure and simple you do not need any tears for a Virus to get in there, if your theory about HIV was accurate, than men would not get ANY std's from women, I think you are just trying to dilute yourself into believing it cant happen to you. Women can give men HIV, weather it is just your slit scraping across the inside or your piss slit plunging into the Cum soup you mentioned Guess what, There is the only opening Any disease, including HIV, needs to get into your body and infect you.
I cant believe you actually believe the BS you spouted in here, and think there is NO risk for you.