The points RemovableMind made were quite accurate and well said. It's a shame you can't appreciate such truths when they're staring you in the face.
This discussion isn't about genetic birth defects. This discussion is about birth defects caused by toxic substances that damage the sperm. It's been proven that toxic substances can damage sperm. Its also been proven that damaged sperm can cause birth defects. So if a man damages his sperm by abusing alcohol and drugs which have also been proven to cause birth defects and impregnates a woman, the odds of the fetus developing birth defects is substantially higher just as it would be if a woman did the same. So the question posed by the OP is whether or not men should be held to the same standards that women are held to before, during and after conception?
"...And although cigarette advertising associates tobacco smoking with virility, a growing body of research supports the opposite that smoking reduces sperm counts. Heavy use of marijuana has also been linked to similar effects. Even regular intake of cafleine may have sperm- and offspring-damaging impact! GENOTOXIC EFFECTS During the 1950's, doctors said that 10% of U.S. couples were infertile ... and that organic problems in the male partners ac counted for only 10% of those problems. To day, a sixth-over 15%—of our nation's married couples are reportedly infertile, and male dysfunctions are said to account for 30 to 40% of the difficulties. (However, since infertility has traditionally been blamed on women, this increased observance of male dysfunction in couples could reflect a belated recognition of long-ignored facts as well as a new biological trend.)
There is also some evidence suggesting that men with low sperm counts are more likely to produce offspring with birth defects. Erik Jansson, an environmentalist with Friends of the Earth (who's working on anti-birth-defect legislation), notes that artificial insemination of women with frozen sperm from third-party donors results in a birth defect rate of 1% or less ... in sharp contrast to the overall American birth defect rate of 4.5 to 6%. Jansson states that "the most important reason for the dramatic fall in birth defects with third-party donors of sperm is that the artificial insemination laboratories accept only men with high sperm counts . . ." (The FOE staffer has also concluded that the same findings "
suggest that American men are presently responsible for between 78 and 83% of all birth defects in the United States"!).....
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THE SPERM CRISIS
With such high odds that American men are responsible for 78% to 83% of all birth defects in this country, isn't it time that men took more responsiblity for their own behaviour and lifestyles instead of putting all the blame and responsibility on women? Imo, any answer other than 'yes' shows a lack of personal responsibility and moral conscience.