If you have condomless sex, you may be infected with sexually transmitted diseases, such as gonorrhea, syphilis, AIDS and warts. You can check for gonococcal infection about a week after having condomless sex; if you don’t have any discomfort after intercourse, you can check for syphilis infection about a month after having sex; and you can draw blood to check for HIV infection three months and six months after having intercourse because HIV has a certain window period, and even if you are infected, you may not be able to detect it within three months. If there are no genital warts after condomless sex, you can go to the hospital four months after the sex to make sure you are not infected with warts.