I get this too, but according to science we are in the minority.
It used to be a well know thing that a chap would experience an energy loss for a day or so after sex. It was in some ancient religions / philosophies like Dao, and as late as the early 90s, it used to be standard in pro footie for managers to tell the players not to have sex the night before the match. We used to get told not to even at Sunday league level... Around the mid 90s, scientists started studying the phenomena , and basically said it wasn't a thing. Most seemed to believe them, but not the 'NoFap' chaps.