The smell of sperm.

Semen is a mixture of fluid, in addition to sperm, but also includes prostate fluid, epididymis fluid, seminal vesicle fluid and urethra, vas deferens, a variety of secretions, semen and saliva, blood and so on belong to the body fluid, but only the smell of semen is the most significant. Normal semen smells like heather because it is oxidized by a chemical called spermine, a secretion of the prostate gland, but the oxidation of spermine must be accompanied by seminal fluid.