New research challenges the 'bigger is better' mentality, revealing that increased male body size and fat mass are linked to declining reproductive health and fertility. Studies show higher body fat ...

Hoeven’s wrasse (Halichoeres melanurus) is one of many species of reef fish that begin adult life as females and later switch to being functionally male. UC Davis researchers have shown that ...

1. Determining the extent of variation in male mating strategies and reproductive success is necessary to understand the fitness benefits of social and cooperative behaviour. 2. This study assesses ...

Men with a small penis are less likely to become dads, a new study suggests. Men who visited a clinic with fertility problems typically had a reproductive organ one centimeter smaller than other men.

It’s not just about chromosomes. Or reproductive cells. Or any other binary metric. Many genetic, environmental and developmental variations can produce what are thought of as masculine and feminine ...

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For generations, society has equated size with strength, health, and desirability. The belief that “bigger is better” continues to shape how men view their bodies and reproductive health. Yet new ...