6. Trichomoniasis. A one-celled parasite causes this STD, and a frothy, odorous, greenish-yellow discharge can be a sign that a woman has it. Infected men don't usually show signs, though some may experience abnormal penile discharge or pain after urinating or ejaculating. Trichomoniasis can make women more likely to contract HIV if exposed and may increase the likelihood that an HIV-infected woman will transmit HIV to her partner. Trichomoniasis is curable with medications.
7. Genital Herpes. Some victims have bouts of painful genital sores, but many who are infected with genital herpes are unaware because symptoms may be absent or confused with the flu. Caused by two types of the herpes simplex virus, genital herpes has no cure, though antiviral medications may help manage the severity of outbreaks. Because it's a chronic infection, genital herpes can be psychologically distressing for those infected and can cause potentially deadly infections in babies if transmitted from a mother. Transmission from mother to baby is rare, but freshly acquired genital herpes late in pregnancy can boost the risk, says the CDC.
8. HIV. The virus that causes AIDS can lie dormant with no signs for over a decade, though symptoms include extreme fatigue, swollen lymph glands, persistent diarrhea, dry cough, rapid weight loss, pneumonia, night sweats, and a recurring fever. While any of these symptoms alone may not be cause for alarm, since they could be caused by a slew of other illnesses, the only way to be sure is to be tested, advises the CDC. Untreated, HIV can cripple the immune system. The infection may not ever advance to AIDS, but if it does, it can be deadly. While drugs can halt the progression of the virus, no cure exists. Click here to learn more about the prevalence of HIV infections among black women or here to read about one young woman's battle with HIV.
9. Chancroid. This bacterial infection is quite common in Africa and Asia and is also infecting Americans. Chancroid can cause ulcer-like genital sores that are often accompanied by swollen lymph nodes around the groin. Like many STDs, untreated chancroid makes it easier to acquire and spread HIV.
10. Crabs. Days after sex or intimate contact, the intense itching may start—a sign that these blood-sucking parasites may have chosen an unfortunate place to call home. The tiny lice typically spread by moving from one person's pubic hair to a partner's, although it is possible to acquire crabs from clothing, furniture, or bedding. The critters can survive without a human host for about 24 hours.