How do you have multiple rounds of anal sex without having an accident?

Hi everyone,

I was hoping to get some advice regarding anal. I've never had a problem cleaning and then having sex, never an accident or anything, however that's the first round. I've had guys want to go again and I've never been able to because it's always messy. I guess the first round loosens everything up and there's no shot another round will be clear.

How are you guys going multiple rounds and not having accidents? Biological differences between different people?