What is the male reproductive structure called?

The male external organs are seen to be the penis and the two scrotal sacs while the rest are located inside the body.

The sacs contains the testes which produces the male sex hormone called testosterone.

Each testis consists of hundreds of compartments, each packed with many tiny coiled tubes, the seminiferous tubules. The cells lining the tubules gives rise to sperm. The seminiferous tubules join to form larger tubules which eventually form the epididymis. The seminal vesicles, prostate glands and cowpers glands are associated with sperm duct and urethra. The sperm plus these secretions form a milky fluid called the semen.

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."