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Even with modern fertility treatments and the fact that the human male releases about 66 million sperm during each go, it's astounding as to why it's getting even harder for couples to conceive. According to CDC's 2007 Assisted Reproductive Technology (ART) Success Rates Report, 142,435 ART cycles were performed at 430 reporting clinics in the United States during 2006, resulting in 43,412 live births (deliveries of one or more living infants) and 57,569 infants. While the use of ART is still relatively rare as compared to the potential demand, its use has doubled over the past decade.

While women feel the most pressure when it comes to infertility, the men play a role here as well. Studies have proven that men with DNA-damaged sperm can "significantly reduce" the damage by having sex more frequently. Based on a study presented at the 25th annual meeting of the European Society of Human Reproduction and Embryology, it showed that 81% of the men had a reduction in DNA sperm damage after ejaculating for 7 days in a row.

Other studies have linked sperm quality to better fertility, and found that the sperm of older men have an increased risk of more genetic mutations, which probably explains why so many older couples seek expensive infertility treatment. The study states that once a male has past the age of 35, it often takes 12 months or more for a man to impregnate his female partner. And if he's over the age of 40, the risk of miscarriage is great especially if his partner is over age 35.

[livescience]