Many men never see a reproductive specialist; a preventive check around age 18 — semen analysis and testicular ultrasound — ...

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 ...

New research has mapped the cell types that specialize to form reproductive organs in both sexes, identifying key genes and ...

Medically reviewed by Kelly Wood, MD Key Takeaways Hormones serve as chemical messengers in the body and regulate functions ...