The first time a man has not had sex for a long time, or a man who is having sex for the first time, it is easy to ejaculate too quickly due to excessive excitement or strong sexual desire. 2. In addition, if a man suffers from chronic prostatitis, it is easy to ejaculate too quickly during sex. 3. If you’re a person with a sensitive glans, you’re likely to ejaculate too quickly. 4. If you often ejaculate too quickly during sex, and each time your sex life lasts less than 2 minutes, you can usually be diagnosed as premature ejaculation.