When I masturbate, where do I leave my semen?

If you masturbate lying on your back you can uncover your stomach and chest, letting the semen end up there. Have some toilet paper at hand to remove it. You can throw the paper in the waste basket or the toilet. When you masturbate standing up you should have some paper at hand and keep it at the tip of your penis when you come, collecting the semen and throwing it away. When you stay somewhere overnight and have no paper at hand an old sock can be used to clean up.