I think a lot of people associate Semen Retention with Non-ejaculation, which is not accurate. When I was practicing a certain form of Daoist Sorcery (aka Neigong), I practiced strict Semen Retention for 8 years. The first eight months were difficult - while there were good effects, there were also bad side effects like increased aggression, headaches, upset sleep cycle etc. I guess there was not one single thing that helped in the task - food, not watching movies/TV, meditating thrice a day, a lot of Neigong, alchemical/herbal formulae, fasting etc. naturally sublimated the need to ejaculate. There are better blisses available on the meditative path to get addicted to, than ejaculation haha!
But then, over a period of time, I’ve realized that while porn, meaningless sex etc., can feel draining, when in a loving relationship, Sex is very empowering and charges you up like nothing can! In Tantric Buddhism and Hinduism, sexual alchemy is the fast route to super consciousness! When sex is about selfish satiety and that is tied to ejaculation, it drains. Remember, the actual ejaculation happens in the brain and the physical act just follows.
https://www.amazon.com/Taoist-Yoga-Kuan-Charles-Luk/dp/0877280673
These are pretty good books to study on this topic.