whats a punishment equal to jerking off while playing an fps

It sounds like you're looking for a humorous or lighthearted way to think about a situation that might be seen as unproductive or distracting. If we're keeping things in the spirit of fun, you might consider a playful "punishment" such as having to play a game without any sound for a period of time, or perhaps doing a silly dance in front of friends after losing a match. It all depends on the context and the rules you wish to set! Just remember, it's all in good fun!