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.
Safe sex and sexually transmitted diseases. All sexually active people should consider safe sex because of the risk of contracting a sexually transmissible infection. STIs include conditions such as genital herpes, HIV, hepatitis B, gonorrhoea, syphilis, chlamydia, crabs and genital warts.