•  Vaginal itching and burning.

•  A yellow-green or gray vaginal discharge with an odor.

•  Burning or pain when passing urine.

•  Pain during sex.

•  Discomfort when passing urine.

•  Pain during sex.

•  Irritation and itching of the penis.

•  The oral medication metronidazole (Flagyl).

•  Treating sexual partners to prevent spreading the infection and getting it again.

•  The only sure way to avoid STIs is not having sex. This includes intercourse, oral sex, anal sex, and genital-to-genital contact. Caressing, hugging, dry kissing, and masturbation are no risk or extremely low-risk practices. So is limiting your sexual contact to one person your entire life. This is if your partner does not have an STI and has sex only with you.

•  Latex and polyurethane condoms can help reduce the risk of spreading HIV and other STIs (i.e., chlamydia, gonorrhea, and trichomoniasis). To do this, they must be used the right way for every sex act. They do not get rid of the risk entirely. Barriers made of natural membranes, such as from lamb, do not give good protection against STIs.

•  Females and males should use latex or polyurethane condoms every time they have genital-to-genital contact and/or oral sex. Use polyurethane condoms if either partner is allergic to latex. You don’t need condoms to prevent STIs if you have sex only with one partner and neither of you has an STI.

•  For oral-vaginal sex and oral-anal sex, use latex dams (“doilies”). These are latex squares.

•  Latex condoms with spermicides, such as nonoxynol-9 (N–9) are no better than other lubricated condoms for preventing HIV/STIs. Spermicides with N–9 do not prevent chlamydia, cervical gonorrhea, or HIV. on’t use spermicides alone to prevent HIV/STIs. Using spermicides with N–9 often has been linked with genital lesions which may increase the risk of spreading HIV. Also, N–9 may increase the risk of spreading HIV during anal intercourse.

•  Use water-based lubricants, such as K-Y Brand Jelly. Don’t use oil-based or “petroleum” ones, such as Vaseline. They can damage latex barriers.

•  To lower your risk for HPV, use latex or polyurethane condoms. These work best at covering areas of the body that HPV is most likely to affect. A diaphragm does not prevent the spread of HPV.

•  Don’t have sex while under the influence of drugs or alcohol. You are less likely to use “safer sex” measures.

•  Limit sexual partners. Sexual contact with many persons increases the risk for STIs, especially if no protection is used.

•  Discuss a new partner’s sexual history with him or her before you start having sex. Know that persons are not always honest about their sexual past.

•  Avoid sexual contact with persons whose health status and health practices are not known.

•  Follow your doctor’s advice to check for STIs.