Open Sores, Blisters or Bumps Near the Mouth or Genitals

Many STDs -- herpes in particular -- are characterized by blisters or sores on the penis or vagina, testicles, on or around the anus, buttocks, or thighs. These sores aren’t just limited to the genitals, however -- they can be found on the lips, tongue, gums and other parts of the body. If you notice unusual sores or blisters on your body or your partner’s, refrain from sexual activity. Even oral sex will put you at risk for contracting or spreading an STD. Instead, have a conversation with your partner and insist that you both schedule appointments for STD screenings. Even if you find the lesion before having intercourse, you still may have been exposed to an STD, so if you notice any of these signs on someone with whom you’ve already had sexual contact, it’s important that you schedule a screening to find out if you’ve already been exposed.

Painful Intercourse or Painful Urination

If you experience a burning sensation during urination or intercourse, it may be the sign of an STD. Many STDs, including chlamydia and gonorrhea, cause sufferers to experience painful symptoms during urination and intercourse, so if you experience these signs, you shouldn’t just chalk it up to a urinary tract infection. And even if you aren’t experiencing any other symptoms, it’s important to remember that you still may be contagious, and you should refrain from intimacy until you’re certain of the cause of your discomfort.

General Malaise or Signs of General Illness

Many diseases, including HIV, will trigger flu-like symptoms -- including fever, fatigue, body aches and nausea -- shortly after infection. While many people confuse these symptoms with the onset of a cold or flu bug, if you recently had unprotected sex or if you’re in a monogamous relationship and suspect infidelity, you may want to have yourself screened to rule out a possible STD.