Alcohol has a definite effect on sperm. When alcohol is not completely metabolized in the body, it has an effect on sperm, often within 24 hours after drinking, and more than 24 hours after the alcohol is metabolized, it has less effect on sperm. However, the sperm affected by alcohol still exists in the body, so it is not recommended to prepare for pregnancy at this time. Long-term intake of large amounts of alcohol can affect the quality of a man’s semen and may affect his reproductive function. If the next generation is conceived, it may lead to neurological lesions in the child, so it is recommended that both men and women refrain from drinking during contraception for the purpose of eugenics. The male sperm maturation and development cycle is about 3 months. If you want to prepare for pregnancy after drinking frequently, it is recommended to abstain from alcohol for more than 3 months before preparing for pregnancy, so that alcohol has basically no effect on sperm.