<unk>  refers to a sexually mature<unk> 's inability to impregnate a fertile female. In humans it accounts for 40–50% of<unk> . It affects approximately 7% of all men.<unk>  is commonly due to deficiencies in the semen, and semen quality is used as a surrogate measure of<unk>  fecundity. More recently, advance sperm analyses that examine intracellular sperm components are being developed.
Male infertility
Oncofertility
Female infertility
Infertility
Ejaculation disorders
Chronic testicular pain
Delayed puberty
Late-onset hypogonadism