Think about it. The penis is an organ, it has tissues inside. It requires oxygen and blood. This is why you get morning erections while you sleep, this is a way for the body to oxygenate the penis, but the nerves travelling from your brain to the penis also need activity. This is why your penis shrinks and your libido goes away on NoFap. People accept the penis becoming smaller as part of flatline, yet nobody even tries to understand why this happens. This is a physical reaction to a physical change. You reduced/cut out the amount of oxygen, blood, nerve activity to the penis. The result? The penis becomes less efficient at erections, and that's exactly what happens on flatline. People can be on this flatline for weeks, months, if not years. Ironically, when they claim to "be out of it" or finally be cured, how do they come out of it? With either sex or masturbation, once again giving the brain and body what it needed, oxygen and blood to the penis and activity to nerves. Porn is irrelevant. People would argue, if that's the case, morning woods keep your penis oxygenated, if that was the case, then how come a lot if not most people who go on NoFap for weeks, months, they lose morning erection, and if this was the case, if the penis was properly oxygenated with just morning erections, then it wouldn't shrink on fap as it happens to most people who go on it. https://www.webmd.com/erectile-dysfunction/news/20080703/erections-use-em-or-lose-em# https://www.latimes.com/health/la-he-mating18-2008aug18-story.html "Regular sexual activity preserves potency in a similar fashion as physical exercise maintains functional capacity,"