We’ve all heard the rumors about sperm—pineapple, hot tubs, ladies who are allergic. But what’s the truth? We consulted the experts for the facts:

It’s Fast and Furious, Right from the Start
Get this: The first moment of ejaculation contains the highest concentration of sperm, says board-certified urologist Harry Fisch, M.D., clinical professor of reproductive medicine at Weill Medical College of Cornell University.
It Sticks Around Longer Than You Think
Sperm typically stays in your body for 48 hours after séx, however, “it can hang around for as long as five days to a week,” depending on how “friendly” your cervical mucus is, says Fisch. Interestingly, cervical mucus protects sperm and helps it stay longer in the body around ovulation, when you’re most fertile.

Lots of Sex or Masturbat;on Won’t Lower a Guy’s Sperm Count
Don’t worry, he doesn’t have a limited supply of swimmers that he’s going to use up, says reproductive endocrinologist Carrie Wambach, M.D., from Southern California Reproductive Center in Los Angeles. That said, frequent ejaculation may lower the volume, but if he generally has a normal sperm count this shouldn’t make much of an impact, she says.

Temperature CAN Lower His Sperm Count
Apparently, his semen fluctuates with the seasons. “Sperm count tends to be lowest in summer months and highest in winter months,” says Fisch, because exposure to heat lessens sperm count. Overheating can include anything as seemingly innocuous as your man having a hot Macbook on his lap or as obvious as the two of you relaxing in a hot tub. “In a Jacuzzi 104 degrees and higher, sperm count can decrease dramatically,” warns Fisch. In fact, this decrease can last for months after extreme overexposure to high temps. “I tell my patients, if you’re trying to have kids, don’t go into hot tubs.” Of course, don’t assume you’re totally safe from getting pregnant after you take a dip, either. “It’s not birth control,” he laughs.
 
Pineapple Isn’t Proven to Make Him Taste Better
Unfortunately, scientists haven’t tested this one out yet (can somebody get on that, though?). Semen does contain fructose (naturally occurring sugar), giving it a slightly sweet taste, but there’s never been a real study on the connection between foods a guy eats and the taste of his swimmers, says Fisch. However, this rumor has a ton of anecdotal evidence, so if it seems to work for your partner, we say go ahead and grab the pineapple.

Male and Female Spérm are Created Equal
Spérm either have the X or Y chromosome, but their chances of making it don’t differ, says Fisch. The idea that one type is more resilient or swims faster than the other is just a myth.
It’s Super Rare to Be Allergic to Sperm
We’ve all heard that women can be allergic to spérm, causing inflammation or redness, but both Fisch and Wambach say that it’s very, very rare to be allergic. “I’d look to other factors, like a vaginal infection, first,” says Fisch. There has also been one study on a séxually transmitted allergy to Brazil nuts (where a woman had an allergic reaction to her partner’s spérm after he ate the nuts). But again, cases like this are extremely rare. In the unusual case you are diagnosed as allergic, wearing a condom can prevent irritation.

Spérm Has a Pretty Intense Journey Before the Grand Finale
It takes about two and a half months to prep all the sperm expelled in the average ejaculation. It initially forms in the testicles then moves up to the epididymis. Then fully formed sperm travels through the vas deferens and swings by the seminal vesicles where it mixes with a fluid to form semen. Finally, the prostate adds the last little bit of fluid before ejaculation.

Your Guy’s Health Affects His Sperm
“Spérm may be healthier for men under 40,” says Wambach. “And they’ll definitely be healthier in men who avoid things like smoking, a high-fat diet, and environmental toxins.” So if you’re considering starting or expanding your family, keep that in mind.

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In Short, It Can Be Said That The Human Sperm Cells Are In A Stiff competition for Honor.

Why??
It takes only one sperm cell to fertilize a woman's egg. In fact, the average ejaculate contains 200 million sperm.

Volume; Half a Teaspoon.
That's how much a man typically ejaculates. It isn't much, but - for better or worse - it often does the job.

Duration; Sperm Live for Days
How long can a sperm cell live once inside a woman's body? About two days.

Production Time-Frame; It Takes About Two Months to Make Sperm. "Sperm are being started all the time, just like an assembly line." "You don't wait for a truck to finish the assembly line before starting to build another, right? But just like an assembly line, it takes time to go from the start to the end."

Best Before; Women are born with all the eggs they'll ever have. It's different for men. Men produce sperm all day, every day - throughout their lives. As men age, their sperm may become a little sluggish and their DNA a bit more fragmented. But the factory never closes.


Cheers!