Little brother, this question is very serious. You can think for such a long time at a young age. I admire it. First of all, you should know how to be temperate now. If you are young, you don't know that sperm is expensive, and you are always crying. Secondly, if your partner is a person who will not be loyal to you, just have fun and don't expect to marry her, because even if you can still satisfy her then, she will still cheat. Thirdly. That ability can indeed be maintained and improved through exercise. Isn't the ancient emperor like that? Food supplement is very important. Eat more foods that are beneficial to that aspect, such as leeks, dog meat, mutton and seafood. Because this ability varies from person to person, you should combine your own actual situation. Personally, I don't think those medicines on TV are credible. Although I haven't used them, it's safe to take food supplements!