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.
Boxers or briefs? Hey, Alice! I just found out about you, and you're the perfect avenue for finding out the answer to a question that a lot of my friends have been wondering about: What are the health-related pros and cons associated with wearing different types of men's underwear: briefs (tighty-whiteys) and boxers?