Semen ejaculation into the vagina can cause an odor, but this is normal. Because sperm itself has an odor, it has a faint foul smell. Its main component is protein, which will gradually produce odor and even breed bacteria after leaving the body. Therefore, it is recommended to wash the vulva after intercourse to avoid bacterial infections in the pubic area. If a woman’s vaginal odor is too strong after intercourse, she needs to consider that she may have gynecological diseases such as vaginitis, and it is recommended to go to the hospital for vaginal discharge examination.