There are quite a few sexually transmitted infections, and each of them manifests itself in different ways. Symptoms include itching, burning, rashes and redness of varying intensity in the intimate area, enlarged lymph nodes, burning sensation during urination, discomfort and pain in the groin, perineum or lower abdomen. This can also include uncharacteristic discharge from the genitals of an atypical color, an unpleasant fetid odor of discharge and painful sensations during intimate contact.