Sexual energy can be changed to chi. There is a very specific way to do this. This kind of this must be taught one on one. Many chinese teachers if they know it refuse to teach it for various reasons.
Porn and masterbation is fine but you need to learn how not to ejaculate and again change the sperm to chi. If you keep losing all your sperm it will hurt you sex life. I had a student come see me one time and said he is 29 years old. He had a very high sex drive his whole life and ejaculated everyday. Now he is getting married and has no sex drive. He also has problems getting erections. This man did not know what happen? I expained to him that he spend all his sexual energy now you are feeling the consequences, That is the short answer