T he most important rule for any sexually active woman is to empty their bladder within 15 minutes of sex. Whether it is same-sex, with a sex toy or heterosexual intercourse, unless you empty your bladder you are more likely to get a urinary tract infection UTI , which can be very uncomfortable and can lead to bigger problems. The reason that women get UTIs after sex is that the urethra is very short and the bladder is close to it, so during penetrative sex you are allowing bacteria direct access to your bladder. Penetrative sex upsets the natural balance of your body so always make sure to go to the bathroom afterwards. What women must avoid is douching. Intra-vaginal douching or cleansing disrupts the delicate natural balance of the vaginal bacteria, which maintains a status of health.