Remember when we all thought Mountain Dew affected a guy's sperm count? Luckily, those days are gone ... and we're hoping no one actually used the soda as a form of birth control. But, there still are some very ordinary things that do influence a man's fertility.
From the unhealthy habits, such as drinking, to the stranger ones, like putting on sunscreen, we're counting down the things he loves doing that are decreasing his sperm production.
1. Wearing Sunscreen
Lathering up before a day in the sun may actually be protecting him against skin cancer but it's also potentially impairing his fertility. A brand new study from Longitudinal Investigation of Fertility and the Environment (LIFE) found that chemicals commonly found in sunscreen can impair male fertility by 30 percent.
When the skin absorbs chemicals which filter out UV rays, like BP-2 or 3OH-BP, it can interfere with his hormones. Researchers say men concerned about fertility should wash off sunscreen when they head indoors.
2. Eating Processed Meat
Trying to conceive? He may want to re-think those BLTs he's been scarfing down every day. A new study found that processed meat, like sausage or bacon, can significantly harm sperm quality.
I know, I know, he's probably thinking, take my eyes but not the bacon, but the Harvard University researchers found that men who ate half a portion of processed meat a day had 5.5 percent 'normal' shaped sperm cells, compared to 7.2 percent who ate less. Instead, they found that fish are possibly the secret to better sperm. Bacon, egg and halibut sandwich, anyone?
3. Watching TV
Another reason he should hand over that remote? The couch isn't doing much for his health, as you may have guessed. But, it's not just his physique and motivation that are at risk as he kicks his feet up on the sofa and inhales a bag of Doritos.
A study from the British Journal of Sports Medicine confirmed that men who watch a lot of TV have fewer sperm than men who exercise moderately or vigorously each week.
Couch potatoes who viewed more than 20 hours of television a week had 44 percent lower sperm count than men who watched almost no television. Time to get moving, fellas.
Turns out, the beer belly isn't the only bad side effect from his favorite beverage. Drinking alcohol can lower testosterone levels, which in turn leads to decreased sperm quality and production. Moderation is key with drinking — and hopefully he stops doing it on the couch watching TV, too.
5. Not Having Sex
While we just ruled out some of his favorite activities, he will probably be more apt to help remedy this sperm-zapper.
While some have said "saving sperm" until a woman is most fertile could help couples who are trying to conceive, it actually has no benefit and can make matters worse. For guys with low sperm counts, abstaining from even one day of sex can decrease their production even further, according to researchers at Soroka University Medical Centre in Israel. Abstaining from sex also causes sperm to change in shape, a sign that the sperm is going stale.
Stress is bad for numerous emotional and physical reasons, but his fertility is at risk too. Whether he's anxious about work or even having a low sperm count, severe or prolonged stress can interfere with testosterone production. We know some fun stress-busters for you and you guy. Wink, wink.
7. Eating Soy
Whoever thought something as delicious (and addictive) as edamame could be so detrimental to the reproductive system?
A 2008 Harvard School of Public Health study revealed that even half a serving of soy a day was enough to harm a man's sperm production. Isoflavones, which are found in soy products actually mimic estrogen. More tofu for you.
8. Using His Laptop & Cell Phone
As addicted as he is to his two favorite pieces of technology, it might be best for his sperm count to avoid using them for long periods of time.
Researchers warn that the heat given off from laptops may increase the temperature in his scrotum and reduce sperm production.
In 2008, a study revealed a strong association between cell phone use and sperm count, saying that those who talked for four or more hours had fewer, weaker sperm.
More recently, researchers discovered that men who carry their phones in their pocket or on their belt (they still do that?) were more likely to have fewer, inactive sperm.
9. Being A Vegetarian
Thought a plant-based diet pretty much made you healthy as a whistle? Us too. Until this study came out saying that a diet rich in fruit and vegetables may harm fertility!
Researchers at Loma Linda University Medical School found that vegetarians and vegans had much lower sperm counts compared with carnivores, 50 million sperm per ml compared with 70 million per ml.
They also had less active sperm. One third of sperm were active for veggies and vegans versus nearly 60 percent for meat eaters. What's to blame? The guess is vitamin deficiencies and those evil soy replacements we just told you about.
You may think you're not doing any major damage by simply sitting in a chair all day at work, but spending too much time in a chair can shorten the muscles of the pelvic floor. What this means, in regards to orgasms, is that the tightness of these muscles can stand in the way of climaxing. You should always make it a point to get up and do stretches throughout the day.