Sexual differentiation in humans Sexual differentiation in humans Sexual differentiation in humans is the process of development of sex differences in humans. It is defined as the development of phenotypic structures consequent to the action of hormones produced following gonadal determination. Sexual differentiation includes development of different genitalia and the internal genital tracts, breasts, body hair, and plays a role in gender identification. The development of sexual differences begins with the XY sex-determination system that is present in humans, and complex mechanisms are responsible for the development of the phenotypic differences between male and female humans from an undifferentiated zygote. Females have two X
(What Is) Love? (What Is) Love? "(What Is) Love?" is a song recorded by American entertainer Jennifer Lopez. Originally entitled "What Is Love?", the song appeared on the soundtrack to "The Back-up Plan" (2010), a film in which Lopez stars. The song was later included on Lopez's seventh studio album "Love?" (2011), as the album's title track. "(What Is) Love?" is a midtempo electropop song written by Diana "Wynter" Gordon, with the song's producer Emile "D'Mile" Dernst II. The song is about "not knowing what love is," according to Gordon. A remix of "(What Is) Love?", entitled "What Is Love? Part II", was