The distinction between organic and inorganic carbon compounds, while useful in organizing the vast subject of chemistry... is somewhat arbitrary. Organic chemistry is the science concerned with all aspects of organic compounds. Organic synthesis is the methodology of their preparation.
No, it is not possible to contract the typical STDs, such as syphilis, gonorrhea, chlamydia, hepatitis B, etc. from wearing someone else's dirty underwear. However crabs and scabies, may be spread in this fashion.
Doctor: Thank you for the comment Guest. Yes, it is possible to be due to hormones. The patient in the question is talking about an ammonical smell which makes me suspect an Urinary tract infection with some dribbling of urine. The urine is broken down by bacteria which can break down ammonia and cause the smell. A physical defect in the urethra or incontinence can also cause the underwear wetness.