Pantsing and Stripping Forums

This sounds like the Washington High series by UMLB.

There were 3 parts (maybe more but I never saw them):

Gym Class (The Strip Dodgeball part you mentioned)
Wheel of Fortune (Teacher makes class spin a wheel with different forfeits on it)
Strip Games (A number of Stripping games featuring the ...

He still posts on Blondie's new board. Here's a link to his profile (He goes by Joex over there):

https://www.booksiesilk.com/portfolio-view/joex-49566