Anal blur

When you can’t really remember who you first had anal with, but you know you’ve had it pretty much every time since.

Person 1: At least I had anal this weekend.
Person 2: Thanks to Chris for opening that world up for you back in Miami.
Person 1: Was Chris the first person I had it with?

Person 2: I thought so…
Person 1: I dont know. It's an anal blur.