| Re: sperm
the sperms are cells, they have a specific structure, that consists of a head a neck and a long tail...but i think u mean what are the materials of semen.
well, including the sperms, the other materials of semen are...fructose, prostaglandins,some lipids,few enzymes, and a little citric acid, a significant number of bicarbonate ions(hence alkaline ph), also, some amount of mucus.
what substances increase spermatogenesis, well, i dont know of any specific substance, (though certain medicines do exist), i suggest u consult a sexologist, for that question. | 
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