This Kind Of Sex Makes Men Orgasm MUCH Faster, Says Study

We as human beings are competitive at everything from sports to pie eating. It's in our physical makeup to be competitive — so much so that even sperm is competitive.

Sperm competition is the physical competition between the sperm of two separate males to fertilize the eggs of a female. Males have evolved adaptations to increase their chances of success in sperm competition, and it could be the reason why men ejaculate larger quantities of semen (with more moving sperm) faster when exposed to images of new females.

In the animal kingdom, a male's fitness is usually measured by the numbers of females inseminated, and in many animal species females mate with many male partners. When this happens, whose sperm will fertilize her eggs?

Males in many species have evolved mechanisms to give their sperm a leg up on the competition.

Let's take for an example the black-winged damselfly. The female will mate with several males in the span of a several hours, and stores their sperm in a receptacle (an organ in her reproductive tract) known as the spermatheca. 

The male black-winged damselfly has a special adapted penis that acts as a kind of scrub brush. During mating, the male will pump his abdomen up and down, effectively cleaning between 90 and 100 percent of the competing sperm from the female's spermatheca. He then will deposit his own sperm, effectively winning the sperm competition.

An article in Medical Daily says that men have a higher quality and a faster speed of orgasm with new sex because of sperm competition.

And a recent study published in the journal Evolutionary Psychological Science says, "Males in many species differentially allocate sperm and seminal fluid depending on certain social variables including perceived sperm competition and female reproductive status. In some species, males reduce their investment in sperm quality or quantity upon repeated matings with the same female, and increase such investment when mated to a novel female."

The study recruited 21 heterosexual men between the ages of 18 and 23, who were asked to watch seven sexually explicit videos in a private room every 48 to 75 hours for 15 days. Science! The first six videos depicted the same actress and actor, while the seventh film had a different actress but the same actor.

Each video consisted of a 3-minute snippet from a longer 20-minute video and was played on repeat until the men climaxed. The participants were asked to write down the time they started watching the film, at what time they ejaculated, and whether all of their ejaculate made it into the collection cup.

The researchers also determined the time of ejaculate volume and number of motile sperm from each subject. If some of the ejaculate didn't make it into the cup, it wasn't included in the date.

The study found that the time it took the subjects to ejaculate ranged between 4 and 21 minutes. When it came to the first six films, there was no habituation effect. In other words, watching the same woman over and over again didn't increase or decrease the time it took to orgasm.

However, the men orgasmed faster and with higher quality when viewing the seventh film, which included a new woman.

The researchers concluded, "Our findings of decreased time to ejaculation and increased ejaculate volume and number of motile sperm with novel female stimulus suggest selective pressures in our evolutionary past for greater investment in and more rapid transfer of ejaculates in mating with females other than male's social partner."

I guess it's because of evolution that whoever gets to the finish line first, wins the sperm competition.