The act of rubbing the penis against the vaginal opening carries some risk of unwanted pregnancy, and as long as a condom is not worn for protection, it is necessary to take an emergency contraceptive pill within 72 hours of sex, and the sooner the better. When the male penis is sexually aroused and erected, it will secrete a clear alkaline mucus, which is not only prostate fluid, which also contains a small amount of semen. Therefore, even if there is no substantial sexual intercourse (the penis does not enter the vagina and there is no ejaculation), this mucus will get on the vaginal opening and may even enter the vagina and uterus, resulting in an unwanted pregnancy. Therefore, it is recommended that emergency contraceptive pills should still be taken as early as possible afterward to prevent pregnancy. However, emergency contraceptive pills have greater side effects and cannot be used as a regular method of contraception. Therefore, it is safer to wear a condom throughout the entire period afterward, regardless of whether or not you have a substantial sex life.