Not sure about masterbation or sex, it probably does but only for a short time....Wedding bands on the other hand...
"A man's testosterone levels drop significantly when he holds an infant. Even holding a baby doll can decrease levels of the male virility hormone.
Married men, whether fathers or not, have markedly lower testosterone levels than single males, according to one of the first studies of how the hormone changes when men marry and become fathers. Results of the study, done by a team of Harvard University anthropologists, increase our knowledge of human biology and may have implications for so-called "male menopause."
http://www.news.harvard.edu/gazette/...tosterone.html
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"It is my conviction that killing under the cloak of war is nothing but an act of murder." - Einstein