This article has been cited by other articles in PMC. Abstract Background: The aim of the study was to assess the effect of four repeated ejaculations on the same day at two-hour intervals on conventional and functional semen parameters. Furthermore, intracellular reactive oxygen ROS production, sperm DNA fragmentation and mitochondrial function were evaluated by flow cytometry. Results: An overall decreasing trend was noted in the conventional semen parameters at second, third and fourth evaluations after two hours of abstinence in comparison to first evaluation after 3—4 days of abstinence.
Metrics details Abstract 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 quantity or quality upon repeated matings with the same female and increase such investment when mated to a novel female. We tested for effects of stimulus habituation and novelty on ejaculated semen parameters in humans. We analyzed ejaculates produced through masturbation with stimulation from sexually explicit films. When males were exposed successively to the same female six times, we saw no change in ejaculate parameters between the first and sixth exposures to the same female. However, ejaculate volume and total motile sperm count significantly increased when males were exposed to a novel female. Time to ejaculation also decreased significantly upon exposure to a novel female.
One word sums up the number of sperm released during sex: competition. Every sperm is great. In fact, the average male will produce roughly billion sperm cells over a lifetime and shed at least one billion of them per month.
Summary For most men, ejaculating is synonymous with having an orgasm, although some men can have an orgasm without ejaculating. Ejaculate contains fluid from the prostate, seminal vesicles, and bulbourethral glands. Though it contains a wide variety of substances , including citric acid, cholesterol , mucus, and water, its primary job is to deliver sperm. Research shows that the frequency with which a man ejaculates may affect his health, sperm count, and overall well-being.