Sorry for any thread disruptions earlier. I'll just share my experience instead.
To me celibacy means no sex, it doesn't mean no masturbation. That said, I've gone as long as a year without masturbating. The first 6 months were increasingly difficult, but after that I experienced a breakthrough and my body started to organize itself differently. It's as though my body just gave up on the possibility of ejaculation and just didn't bother trying to incite it anymore. However, I experienced periods of depression, anger, rage, and uncontrollable emotions. It was around the 7 month mark that I learned about Daoist cultivation. I don't believe the entire practice, as explained, is necessarily useful, just the general concept. Basically, this energy MUST be expressed, or it leads to health problems. The natural, animal mode of expression is to express it outwards, by cumming. The cultivated way of expressing it is by directing it inwards.
Since I already studied oriental medicine and understood the way the qi meridians worked, it wasn't hard for me to learn. The way they teach the process is that you masturbate but without any imagery or imagination. You have to stay completely present, and work with your body as-is. If you feel yourself getting too aroused, you need to take a break and revert to deep breathing. The breath is key, you have to learn to breathe right down into your pelvic floor. I've modified the technique so that as I do genital stimulation, I might rub my heart centre with the other hand, or my throat, or my third eye. Doing this gets the sexual energy converting to other areas, like a network. Instead of the energy just splooshing out of your dick, it ends up traveling to other places. Eventually, each time you clench the pelvic floor, the energy moves upward throughout the body. Something about training the genitals to not expel semen in the first 6 months makes it more prone to send the sensations upwards and outwards. My experience of this was not only kundalini, but smooth, relaxing energy waves spreading up and down throughout the entire body. It actually results in the loss of erection because the energy goes elsewhere.
More recently, this year, I learned about tantric massage. I first received one from an elder teacher who knows all about this stuff, but more from the vedic understanding of tantra. In a session if you get hard, he will simply massage the energy elsewhere into the other chakras. It helps train the body to always send the energy elsewhere. I had some very, very powerful spiritual experiences with this technique. I later took one of his workshops to learn how to do the integrative massage on others. Basically, by touching every part of the body and connecting it to every other part of the body, it opens a universal channeling system so that sexual energy goes anywhere and everywhere.
I respect people who choose the direct celibacy/no fap path, but I find for myself that with a few additional steps, you can really harness a lot of spiritual potential by using that build up of energy. In oriental medicine and daoism, you basically convert your essence (which is a kind of energy) into other kinds of bodily energy, so it becomes a vital force that doesn't exhaust you... and because of this diversion, the pent up energy gets used instead of slowly driving you mad. Also, some people press down on their urethra or their pube muscles get so strong that they basically have a retrograde ejaculation. That's still ejaculation, it's not the same as what I'm talking about.
What I find really fascinating is that in oriental medicine, there are "jing tonics". The emperors of China used to use them, because they were more or less having sex constantly with their harems of concubines. I've used these tonics myself and they are quite powerful. Originally when I was still cumming every day, the tonics would replenish my semen very quickly. However, since doing the Daoist cultivation, I've noticed that cum and essence aren't exactly the same thing. You can use all the jing tonics you want but there is something unique to the vital energy force of the life gate (where cum is stored) that has to build naturally, and non-physically. So I think there might be some wisdom in the teachings that ejaculation depletes your life, and no matter how many tonics you take you will never really restore it all. I've found that jing tonics don't truly restore essence, for this reason. Only time and abstinence do that.
The way Daoism describes energy cultivation is through the micro-cosmic orbit. The energy leaves the life gate (basically just above the pelvic floor) as you clench, and goes upward along the spine into the brain to "nourish the marrow", and then it goes down the front of the body back to the life gate where it gets stored as vital life force. Going by the chakra system, the energy goes up the spine, into the brain through the occipital cavity, and into the pineal gland, before going out the crown. However, the actual experience of it, I've noticed, is just an energy wave going up both the front and back of the body. When you get good at this practice, the energy goes both up and down the body at the same time -- actually it goes everywhere, including the four limbs. In the Daoist teachings they say that energy going up the front is pathological, but I haven't found this. Their model is too two-dimensional. It works more non-linearly. Energy is going up and down at the same time, kind of like how an electric current would in a circuit -- you can't really say where an electron is at any given time, it's just everywhere.
I've found that when I do the Daoist cultivation without ejaculation, I feel completely satisfied and energized. It makes me a lot stronger. Also, people tend to be more attracted to me for some reason. I read on a no-fap site once that guys who cum a lot have changes to their pheromones. That may be true, but in my opinion having a lot of energy in the life gate creates a very strong second chakra energy and that's the main reason people become more attracted to you. Guys who blow their loads all the time whether their body wants to or not are taking themselves out of the mating game. There's something about guys who cum rarely or not at all that look absolutely vibrant -- I don't really know why that is, from a scientific perspective. I know the prostate stores a lot of minerals, like zinc, maybe that has something to do with it.
I'm not perfect though... I still go through periods where I end up ejaculating a lot. I don't think it's worth guilt tripping oneself over. If you end up doing it, just enjoy it. A lot of people take the celibacy thing too far and turn it into a shaming practice... they end up cumming by accident and flog themselves for it. They'll abstain for like, 50 days, and then cum, and then freak out about it. I see no point in that. We're all only human. The Daoist stuff fascinates me though and it's been the most effective system for me. I've met a few guys over the years who told me in confidence that they have tried it or something like it and they have had wild spiritual experiences. For me there is nothing greater than tantric sex. It's a totally cosmic, loving experience and it brings two people together in a multi-dimensional way that can never be described. It can be shared between any two people, it doesn't matter what sex they are, because the sexual experience is a joined energy field that is not defined by the physical body. If one person goes cosmic, the other person joins them. Just like sex is about mutual pleasure, tantra is about mutual ascension. What's sad is that when you mention the kama sutra, most people just think of it as a book that talks about sexual positions. Really it's teaching you to have sex with God. It's the easiest way to have the Non-Self experience in a blissful way, and to have Divine contact, without doing drugs or intensive meditation practices.
I have had the Non-Self experience through intense suffering, and through intense bliss. Both are valid. It's just that the suffering path is more common, and that might have to do with what people believe they deserve. There's so much shame about sexual bliss and euphoria from so many aspects of human culture, that people don't associate Divinity with sex at all -- especially in the west where Christian guilt has infiltrated every aspect of culture. Even the non-religious are affected. So people think that life is about suffering and hardship, as though it's the only way to feel worthy. Nothing shuts down the second chakra more than those belief systems... so no wonder sex becomes a purely carnal practice, disconnected from the spirit.
As for entity contact, I think that's extremely rare, just like possession is. I've only met a small handful of people in my entire life who had genuine entity intrusion, and the majority of them invited it in by doing dark magic without proper protections. It doesn't tend to happen to every day mundane people who are just getting off. And it's more likely to happen in darker sexual practices, where people are using shame, degradation, rape (or play-rape) and channeling sexual energy into the shadow. You have to really lower your vibration to attract that stuff, or be stupidly calling it in of your own free will. The other people were high level and didn't know it, so they were innocently going through life attracting stuff that they didn't understand because their energy was so delicious. I don't think of it as right or wrong, just another experience. Some people like to dwell there. People can also attract negative forces simply by dwelling in their own dark states for too long, like brooding. Just because you avoid sex doesn't mean you're avoiding darkness. You've still gotta deal with your personal shit one way or another.