when I ejackulate, my head goes up and back all by it's self. this only happens while i'm cumming durring ejackulatine. during this moment i'm laying down on my bed. I am very comfortable at this moment, but this happens all the time, but only after I hit final climax.
it does happen while i'm peeing i'll stand there at the toilet and start peeing but then get a chill, and my head just goes up and back.