What would make a guy wash immediately after fooling around?

Ok-I am not trying to be funny or gross,but my sister asked me this and I have noooo clue. Immediately after fooling around he jumps in the shower,but he wont have sex!!!! While fooling around he reaches climax but makes no sound and is completely quiet during it all???What in the world could be the reason this guy is acting this way?/ I am married for 14 years and know this is not normal. He is 26 and should be in his prime sex stage!! Any ideas?? Only serious answers please!