 I'm male, can you tell me what happens if during the time of nightfall we don't allow sperm to come out by closing the neck of the penis deliberately or unknowingly? Okay, no, please don't. I don't know who's asking you to do this, but strangling your penis in order to control nightfall or any kind of ejaculation for that matter is really not a good idea. So there's a story of a man called Boston Corbett who lived in America in the 1800s and one day he encountered these two sex workers and the way they were looking at him, the way they were dressed. He found himself getting an involuntary erection and he was so angry with himself for feeling like this that apparently he went straight back home, took a pair of scissors and he chopped off his testicles. Now when I tell you the story, your first reaction is, oh my god that's demented, that's crazy, why would he do that? That's exactly how it sounds when you say that you want to mutilate your penis in order to prevent nightfall. You know, I completely understand that you may want to be celibate, maybe you don't have sex, maybe you don't want to masturbate and that's absolutely fine. That is your choice to make, but you have to remember two things. Arousal is the most natural and the most involuntary instinct of the human body. You are going to feel it whether you like it or not. As human beings we are lucky enough to have a brain that permits us to make choices, so make that choice. Don't do anything about the arousal. You don't have to follow up with it, but honestly strangling your penis in order to avoid this arousal from happening is really not going to be the answer to anything.