Not in anal sex ....For example, I had bleeding hemorrhoids when I was in the toilet, and the paper could not put all the blood away. And I still feel kind of inconvenient in the butt, as there might be still some blood left in the butt. And if I sit down on the chair where there is some blood, will the blood on the chair go through the trousers and infect the blood in my bleeding hemorrhoids ? I know my this question is kind of stupid, but I am extremly worried, as this happened in a club.