Schistosomiasis (bilharziasis) is a major human disease caused by three species of the genus Schistosoma, known collectively as blood flukes. Africa and western Asia (e.g., Iran, Iraq) are endemic centres for S. haematobium; S. mansoni also is found in these areas, as well as inâ¦
How Alcohol Damages Sperm. Alcohol can reduce the quantity of sperm a man produces (his sperm count) and the quality of that sperm. One way in which alcohol does this is by preventing the body from absorbing zinc in the normal way. Zinc is found in high quantities in sperm.
In a later study published in BJU International, researchers found that frequent masturbation in young men raised the risk for prostate cancer but that frequent masturbation in older men lowered the risk. Sexual intercourse did not affect prostate cancer risk. Â© 2005-2017 WebMD, LLC.