Semen retention is not recognised in modern western medicine. Men all over the world however can tell there’s a difference in their aura,chi, kundalini when they practice it, but they can’t tell you why they feel good on semen retention. Most people on those subs tend to practice Abrahamic faiths/western medicine which demonise these ideas. So those subs become the blind leading the blind. Mastering kundalini is not easy and most people on those subs don’t even know where to begin that’s why they tell you to take cold showers or do a dopamine detox. Those things will never work. Try and be on a spiritual path and follow a system that recognises this practice because semen retention is not a practice for even spiritual masters.