The main symptoms of venereal disease vary depending on the type of STD, and in many cases, sexually transmitted infections have no symptoms, reports Mayo Clinic. Nonetheless, the infections are still transmittable and left untreated can cause infertility.
Signs of Chlamydia include genital discharge, painful intercourse, painful urination and lower abdominal pain, notes Mayo Clinic. Gonorrhea causes symptoms such as anal itching, bloody discharge from the genitals, painful bowel movements, and aching and swollen testicles. Chlamydia and gonorrhea are bacterial infections of the genital area.
Trichomoniasis is an STI caused by a parasite. In men, the urinary tract is infected, but no symptoms usually appear. In women, trichomoniasis infects the vagina. Signs include painful intercourse, vaginal odor and discharge, says Mayo Clinic.