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Male sperm counts have dropped by 95% since 1900. However some of this is probably due to false estrogens from oil based pesticides so it might clear up whenever we stop using them.

[citation needed] because the world population would crash if that 95% was important... or perhaps it never happened (at least not to that extent, for sure)
http://www.babyhopes.com/blog/debunking-male-fertility-myths-decline-in-sperm-count/

This isn't an example of "cutting both ways", it's an example of conflicting and even contradictory facts. I'm actually really confused about this because it goes against what I've always understood to be true.

Previous studies have shown that the healthiness of the children is strongly correlated to the age of the mother - and in fact the age of the father has little (or at least less) to do with it*. But this study is claiming that the mother's age doesn't matter and it's all about how old the father was.

So which is it?

* The risk of an infant having a birth defect varies according to the mother's age and the medical history of both parents
The risk of having a baby with chromosomal disorders increase as a woman grows older ... risk also rises for non-chromosomal birth defects and pregnancy complications such as gestational diabetes, pre-eclampsia and intrauterine growth retardation
after adjusting for potential confounding of maternal age ... Infants born to older fathers have a slightly increased risk of birth defects. ... However, given the weak association, paternal age appears to play a small role in the aetiology of birth defects

... a perfectly reasonable question if you're asking about false negatives.

Indeed, as with How Common Is A False Negative Pregnancy Test And What Causes It?

Shettles suggests that if you are trying to conceive a girl, shallow penetration from your partner, preferably with the missionary position... don't orgasm during sex.

Shettles suggests that if you are trying to conceive a boy, deep penetration from your partner, preferably with the "doggy style" position... orgasms during sex are a good thing... have your partner drink a caffeinated beverage right before sex.

Shettles suggests that if you are trying to conceive a girl, shallow penetration from your partner, preferably with the missionary position... don't orgasm during sex.

Shettles suggests that if you are trying to conceive a boy, deep penetration from your partner, preferably with the "doggy style" position... orgasms during sex are a good thing... have your partner drink a caffeinated beverage right before sex.

This post above may be a joke, but according to this article drinking coke does cause boys babies:

http://www.babyhopes.com/how-to-conceive-a-boy.htm l
It says "have your partner drink a caffeinated beverage right before sex"