>>99378610I don't know why he did it mainly with Summer, I could probably tell you, if he only did it with Summer; but one time he had Jessica's friends say:
"Have you ever been peed on before?"
"OMG, yum!"
So, it wasn't just Summer, it was mostly Summer and never Beth. I can only assume that Justin also wanted to associate his piss fetish with Beth, but Dan wanted Beth to be his wife substitute and Dan won that encounter. So, he got left with Summer and any character he could get away with.
