IS IT OKAY TO DATE A FRIEND'S EX?

I'VE BEEN HEARING RUMORS FOR A WHILE NOW THAT JAY-Z HAD A RELATIONSHIP WITH AALIYAH. OF COURSE WE ALL KNOW SHE WAS DAME DASH'S BOO. I FOUND THESE PICTURES (I KNOW I'M LATE) AND THEY LOOK LIKE THEY ARE MORE THAN HOMIES TO ME. SO THIS MAKES ME WONDER, IS IT EVER OK TO DATE A FRIENDS EX?

I PERSONALLY THINK IT'S NEVER ACCEPTABLE UNDER ANY CIRCUMSTANCE. BESIDES, WHO WANTS TO HAVE SOMEONE'S SLOPPY SECONDS.