Hello! Thanks for your query. As you describe ,unprotected intercourse and genital ulcer are signs of STD. Genital ulcers are not strictly a sign of an STD. They can occur in patients with Behcet s syndrome, lupus, and some forms of rheumatoid arthritis (all non-communicable diseases). Genital tuberculosis, often caused by direct genital contact with infected sputum, can also present as genital ulcer. A genital ulcer ,usually caused by a sexually transmitted disease such as genital herpes, syphilis, chancroid, or chlamydia trachomatis. You should do a vaginal examination and tested for STD to determine the cause of your genital ulcers. Take care