Some risk results that warrant responsible choices:

Bacterial Vaginosis

Chlamydia
(especially serious for women because it can lead to infertility, chronic pain, and death)

Genital Warts
(There is no cure. Both men and women can get genital warts, in women the HPV wart virus on the cervix can lead to cancer).

Gonorrhea
One million new cases reported each year in the US. Young men aged 20 to 24 have the highest rate. Children vaginally born to women with gonorrhea can get gonorrhea of the eyes while passing through the birth canal, causing blindness. In women it causes pain, fever, infection of the whole body, infertility and possibly death.

Hepatitis B
Causes swelling of the liver. In 10% of those infected, the disease becomes chronic and life threatening. In infants born to HBV infected mothers, 90% will have chronic hepatitis.

Hepatitis C
People infected can have no symptoms for 20 or more years. You should be specifically tested for HCV antibody if you have used IV drugs, received a blood transfusion before 1991, snorted cocaine, been tattooed, or had multiple sex partners. Those chronically infected have a high risk of developing liver cancer or liver failure.

Herpes
Herpes is spread by skin to skin contact. Most exposure occurs when the person has no symptoms of a rash. The virus is shed from the skin so that condoms do not protect against transmission. One in five in the general population have genital herpes. There is no cure at this time.

HIV & AIDS

Molluscum contagiosum
Viral infection of the skin.

Syphilis
Syphilis cases are increasing in the world, 20 out of every 100,000 are infected. After the first symptoms go away, syphilis can be latent for 15 years or so. It affects the brain and spinal cord often causing mental illness or paralysis. It can also cause inflammation of the aorta and rubbery lumps under the skin.

Trichomonas
Trichomonas is a protozoa. Men who have it rarely have symptoms, but when a woman is infected, they have symptoms that can include pain, swelling, and irritation.

These risks should be enough to make people judge very carefully with whom they choose to have sex.