Sentences with phrase «male ejaculate»

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Up to 40,000 U.S. women may be affected by seminal plasma hypersensitivity, an immune reaction to male ejaculate.

Female ejaculate is banned under the new rules, but male ejaculate is allowed.

Not exact matches

In the precise sense homosexual acts comprise anal or oral intercourse chosen by two males, with the intention that at least one of them achieve satisfaction by ejaculating within the other's body.

It seems that what males are hired for in pornographic films is to ejaculate on camera for what is called the «money shot,» which is the crucial event of the film.

«As scientists, we already knew that male butterfly ejaculates were three-fold complex structures we call spermatophores — composed of an outer envelope, an inner matrix of fluids and a bolus of sperm,» says UC's Morehouse.

Recent interdisciplinary research led by Morehouse in the Morehouse Research Lab and Nathan Clark, biologist in the Clark Research Lab at the University of Pittsburgh looked closer at the complex structures and mechanisms within male butterfly ejaculates and the adaptive responses in the female butterfly reproductive tract.

What's more, female ducks have anatomical blind alleys in their vaginas: Unwanted males that can't get very far in end up ejaculating into shallow pouches that keep sperm far away from any eggs.

In males, the Wolffian duct develops into the parts needed to ejaculate sperm, including the epididymis, vas deferens and seminal vesicles.

Certain kinds of male fruit flies, for instance, use a cocktail of proteins in their ejaculate as a secret weapon to gain the edge; these proteins induce the female to increase her sperm uptake or her rate of egg - laying, or even to prevent her from considering any new suitors.

Male fruit flies (Drosophila melanogaster) were genetically engineered to ejaculate when exposed to a red light.

RED - LIGHT DISTRICT Levels of a brain reward compound increased in male fruit flies genetically engineered to ejaculate when exposed to red light when the insects were bathed in the rosy hue.

Female promiscuity — something that occurs in a majority of species, including humans — results in the ejaculates from two or more males overlapping within her reproductive tract.

Martin Wikelski, a zoologist at the University of Washington, has found that these abused males have evolved a unique reproductive strategy: at the sight of a female, they freeze in copulatory poses and ejaculate.

The females can also slightly modify the call, making the male less likely to ejaculate.

At around 7 millimetres long, the processus is used to ejaculate sperm into a female and can stretch to two - thirds the length of a male's body.

The attack doesn't prevent reproduction, since the mating male will already have ejaculated.

Chemicals in male flies» ejaculate are known to inhibit the propensity of females to mate with other flies.

While these XX male mice had the same level of testosterone as normal XY mice, they displayed more masculine sexual behaviours — mounting females more often and ejaculating more frequently.

The sampling allows males to reduce their ejaculate if they find other bugs have been in their bedbug.

How, for instance, do you encourage a male rhino to ejaculate?

He says that ejaculate detection is «the latest male innovation» in the evolutionary race of the sexes to assert dominance in mating.

In a series of follow up experiments, the authors found that the increase in sperm motility when mixing ejaculates was induced by the seminal fluid of rival males, not by their sperm, and that a similar increase could also be induced by mixing sperm with the reproductive tract fluid of queens.

When ant queens mate with multiple males their sperm have a single time - window to compete with rival ejaculates for storage in the reproductive organs of the queens.

«In all likelihood it does not pay for a male to increase investment in both traits concurrently, perhaps because males with larger weaponry face reduced levels of sperm competition and thus have no need to boost the size of their ejaculates, which are energetically expensive to produce.»

Researchers at the University of Copenhagen, Denmark found that mixing ejaculates from different male ants in vitro increased the number of mobile sperm by 50 % compared to control samples which had been mixed with a saline solution.

The toxin - addled males behaved exactly like normal rats, but they never ejaculated.

The unfortunate male wasps duped into ejaculating on orchids are one of the most striking examples of this.

Ejaculates are costly, and males must conserve their supply.

In Atta leafcutter ants, the negative effect of the seminal fluid of other males was negated by secretion from the queen sperm - storage organ, suggesting that queens may control ejaculate competition after sperm storage.

Specifically, blind pockets and clockwise spirals in the vagina can physically block a penis, causing the sperm channel that runs along the outside of the male organ to ejaculate to the side, rather than at the tip, far away from where the female reproductive tract stores sperm for fertilization.

The researchers have witnessed firsthand how sperm from a mating with one male are displaced by a second male's ejaculate — and how some ejaculates resist displacement better than others.

This means estimates of a male's competitive fertilization success are often relative to the specific rival ejaculates and females he is paired with, rather than reflecting a male's overall fitness compared to the larger population.

In many species, the occurrence of female multiple mating (for internal fertilizers) or multi-individual spawning (for external fertilizers) leads to competition for fertilizations among ejaculates from rival males (sperm competition).

By using eggs and ejaculates from many individuals in each reproductive event, the authors provided realistic estimates of male reproductive fitness compared to the population.

By measuring multiple ejaculate traits of each male, the study characterized complex patterns of multivariate selection on combinations of sperm size, speed, and swimming path straightness.

Virtually no tubules examined (0.2 %) contained sperm from both males, supporting our hypothesis that sperm from different ejaculates are stored differentially across the SSTs of female birds.

I worked with a male client who used to masturbate up to eight times a day, ejaculating each time.

Ancient cultures collected male and female ejaculate to imbibe after an encounter: a power drink, if you will.

Adult male rats exposed to genistein are less likely to mount, intromit and ejaculate during mating tests.

When Tiger and her male counterpart, Wolf, suddenly materialize in front of him, Josh ends up ejaculating on Wolf.

Duplicate ejaculates were obtained from 39 male Labrador retriever from Guide Dogs for the Blind (San Rafael, CA) breeding program.

A male dog will mount and ejaculate the sperm.

Most people don't realize that this behavior isn't limited to intact male dogs, nor do they know that neutered males can display erections and ejaculate just like intact males.

During mating, the male cat holds the queen's scruff in his teeth and when he ejaculates, the queen cries out and frequently becomes aggressive.

Not only do males release ejaculate but females experience menstruation.

In male dogs a routine workup for prostatic disease should be performed including cytology and culture of a prostatic wash or ejaculate, ultrasonic examination and possibly prostatic aspiration or biopsy.

A faint breeze stirred and caused the male trees to release their pollen, ejaculating clouds of copious fertility.

«Urinating, ejaculating, bleeding, sneezing,» Miss Saltzman rhapsodized, «the body, male and female, is inscribed in the drips, spills, stains, and sprays that coat the majority of the canvases of the New York School.»

Do not urinate or ejaculate (males only) 2 hours prior to your appointment.