Ok, I decided to take a hot shower at my local gym (24 hr fitness). there are 5 stalls you could take a shower in and these stalls were made of glass walls. Hypothetically, if the person who used the shower before me rubbed his penis or ejaculated in that exact same place in the exact same glass wall in that stall were to have HIV could I have contracted HIV by rubbing my penis at the exact same place he rubbed his?
No. And stop rubbing your Mr. Happy on the stall glass walls. It's driving the guy in the next stall crazy with desire!