Why does he do this?

Guy I’m seeing, when we are making out and getting touchy, randomly decides he has to go to the washroom all of a sudden and then he’s gone for a good 5 min before he comes back and then we continue and have sex

Why does he always go to the washroom at that time?? I guess I could ask him but it’s still kind of new and I don’t want to put him on the spot.