Reproduction

Upending long-held beliefs that testosterone levels fuel sexual desire, a new study has found that while the hormone plays a key role in reproductive success, elevated concentrations may instead drive 'courtship' efforts – particularly in single men.

If you were a flowering plant, wouldn't you want your pollen to be received by a plant of your own kind? According to a new study, at least one plant may ensure that happens, by blasting "rival" pollen off of pollinating animals' bodies.

Scientists have discovered a kind of “pause button” in early human development. This biological mechanism has long been known in other mammals, but its discovery in humans could aid IVF procedures.

A non-hormonal, reversible and safe male pill may be in sight, as scientists successfully silence a protein crucial in fertile sperm production. Knocking out this protein temporarily resulted in unviable sperm, without any lasting impacts on fertility.

Lab-grown testicle organoids that closely resemble the real thing provide a promising model for research that may help our understanding of testicular development and translate into therapeutic applications for male infertility.

Scientists have boosted the motility of slow sperm by blasting the cells with 40-MHz ultrasound waves to induce movement. Capturing the technique's impact on individual sperm cells, the study opens the door to new non-invasive fertility treatments.

Declining fertility can make it harder to have kids in middle age. Now scientists have identified a mechanism that seems to accelerate aging of the ovaries – and found a way, in mice at least, to slow it down to boost fertility later in life.

A new study has linked preconception exposure to phthalates to reduced odds of getting pregnant, adding to a growing body of evidence about the negative effects of these chemicals, commonly found in personal care products like soap and shampoo.

A study has found that plastic additives might be stopping the reproductive habits of a shrimp-like species that is key to the marine food chain. The findings provide a different perspective on the potential damage caused by specific pollutants.

What has eyes, antennae, swimming bristles, a genes stash and a feel for autonomy? The rear end of the bizarre Japanese green syllid worm. Scientists now know how the end of the animal detaches and swims off to find a similar tail of the opposite sex.

Genitalia in the animal kingdom is rarely dull, from penis 'sword' fighting flatworms, to echidnas with four-headed phalluses. Let us introduce a new odd member contender: a beetle with an appendage that looks like you could crack open a beer with it.

A study of nearly 3,000 Swiss men over the course of 13 years has shown a link between frequent cell phone use and a decrease in sperm quantity. What's more, today's 4G and 5G networks may have less of an impact than older communications technology.