According to the conventional understanding, it corresponds to the sacrum and gonads, and is called "Swadhisthana" in Sanskrit, and "Sacral Chakra" in the West. It is also said to correspond to the prostate in men and the uterus in women. Furthermore, it is said that Kundalini sleeps in the Muladhara, or in the Swadhisthana, and the views differ depending on the school of thought.

There are other interpretations regarding the location of Kundalini, and it is also said that Kundalini originally resided in the Swadhisthana, but later descended and lived in the Muladhara. The meaning of Swadhisthana is "one's own dwelling," and it refers to the dwelling of Kundalini herself. ("Mikkyo Yoga," p. 171)

In addition to the conventional understanding, some explanations state that the Muladhara governs masculine energy, and the Swadhisthana governs feminine energy, and that Kundalini awakens when the balance of both energies is achieved. This is different from the conventional understanding, but it resonates more with me.

In my case, I have always had a weak Swadhisthana. This is said to be the unconscious chakra, and it is also said that all karma sleeps there. In fact, it is fortunate that it is weak, and some schools of yoga teach that if the Swadhisthana is awakened first, karma will emerge, so it is better to awaken the Ajna chakra first to avoid being manipulated by karma.

However, when I read the explanations, I feel that I probably used to have an active Swadhisthana, and then I closed it, and intentionally stopped activating it.

Around the time my Swadhisthana awakened, I became sensitive to even the slightest sounds, and even a small sound in the middle of something would sound like thunder, and my body would twitch. My emotions also became more intense, and I was easily excited. The awakening of the Swadhisthana creates a state of nervous sensitivity in the body and mind. ("Mikkyo Yoga," p. 197)

When I was a child, I was particularly sensitive to sounds, and if I was startled, I would twitch and make a huge noise. This seemed to amuse the bullies around me, and I was subjected to persistent bullying, which seems to have damaged my subtle senses, and the sensation of the Swadhisthana became (broken) and unable to move.

The general yoga practice to awaken the Swadhisthana is to sit in Siddhasana and stimulate the area near the Swadhisthana with the heels of the feet. Furthermore, Kecharimudra is performed, and the Swadhisthana is repeatedly contracted and relaxed using the Vajroli technique. ("Mikkyo Yoga," p. 108-109)

This time, I once again felt the weakness of Swadhisthana. Today, I performed Bajroli for the first time in a while, and because I hadn't been using that part for a while, the area around my groin suddenly loosened. Although I'm not doing Bajroli perfectly, even just moving it had a considerable effect.

When I performed Bajroli today and observed myself, the area around Swadhisthana felt very cold, and it seems that it's not being used very much. In my case, the area from Manipura upwards is relatively activated, but Swadhisthana and Muladhara are weak. Muladhara is somewhat active, but still weak, and Swadhisthana feels very cold. Because these areas are weak, it can lead to a decrease in vitality, so I want to be a little more conscious of releasing them.

According to inspiration from guides, if you have a partner, simply being near them can activate the part of you that is the opposite of your own sexuality, and actively engaging in sexual activity can further activate it. With Muladhara and Swadhisthana, the part of your sexuality that has a partner is strengthened as an opposing axis, and the part of your sexuality that is the opposite of your own is activated by the partner's sexual energy. Ultimately, balancing both sexualities within yourself at a 50:50 ratio is said to activate Kundalini (at that level).

However, an actual partner is not essential; you can also balance and activate your energy yourself. Initially, when your energy is not yet moving properly, a partner's sexuality can help. It seems that while Tantra techniques are often misunderstood and associated with sexual relationships, in reality, Tantra is about energy, and sexual contact is not the essence of Tantra.

If you have a partner, they can help with these steps, but even without a partner, you can activate both chakras by balancing your own energy. Once both are activated, there should be no problem.

This is often misunderstood. Tantra techniques, as introduced in the West, are often presented in a way that is closely linked to sexual relationships. However, in reality, Tantra is about energy, and sexual contact is not the essence of Tantra. While it is theoretically possible to have intense sexual contact with full understanding, in most cases, it results in simply consuming energy through intense contact that has no effect, or sometimes, it can lead to a loss of spirituality and a fall from grace. Therefore, intense sexual contact is not recommended. When you have intense sexual contact, you exchange auras with your partner, and while you may exchange positive aspects of your aura, you also share your partner's karma, worries, problems, and ailments. Therefore, intense sexual contact is not recommended unless you are prepared to be with your partner for a long time. It is often said that if you engage in sexual Tantra without proper understanding, your aura will become chaotic and confused.

In such cases, it seems that having a safe, long-term partner and being in a karmic relationship can be helpful for this kind of activation. However, if that is not the case, it is better to activate these energies, namely masculinity (Muladhara) and femininity (Swadhisthana), on your own. There is a saying that if you have a base partner and have done some practice, it is easier to reach this stage with a partner, but such an appropriate partner is usually not found (often, people fail because of arrogance in believing that they have a partner worthy of them).

It is not something that cannot be overcome alone, and there are many suspicious people in the world, and there have been stories of dubious fake gurus surrounding women for sexual pleasure, so basically, it is better to do it alone. By the way, I once received an inquiry from someone who was "being threatened by a certain person that they cannot grow spiritually unless they have sex with a 'creepy' person." The answer is to ignore such fake gurus and cut off contact by blocking their calls. There are many such suspicious and fake gurus. If you lack judgment, you cannot distinguish them, and you may be mind-controlled through coercion and manipulation, and threatened that you will not achieve spiritual growth unless you obey the fake guru. Such things are said by suspicious cults, so it is better to ignore them and leave.

Tantra is about energy, so close contact is not necessary, and being near someone is often sufficient for energy exchange, but being forced into close contact is suspicious.

Rather than dealing with such troublesome things, I think it is sufficient and safe to simply practice Siddhasana, Kechari Mudra, and Vajroli.

For men, there is no particular danger, and it is usually fine to simply have a good relationship with women. For women, fake gurus who force them into close contact are full of cult-like and suspicious behavior, so they should be careful, but I think it is fine to have normal relationships with them.

Alternatively, this could also be done with spiritual counterparts. In my case, I have about five "wives" from past lives who are with me, watching over me, giving me advice, and having "gossip sessions," and I receive energy from them. However, in this case, the energy you receive is weaker if they are simply nearby, so if you explicitly ask them to influence you, they will come closer and strengthen it. This also helps with strengthening the Swadhisthana.

In my case, because my Swadhisthana chakra is weak, when it activates, I experience a strange, slightly uncomfortable sensation, like a tingling. I sometimes experience this sensation when I am near certain people with psychic abilities. I currently interpret this as a reaction caused by the fact that the Swadhisthana chakra is associated with the element of "water," that it is a chakra of the unconscious, and that my Swadhisthana chakra is weak.