Male and female reproductive systems allow human reproduction. Fertilisation occurs when a sperm and egg join to form an embryo. An embryo develops into an unborn baby in the uterus during pregnancy.

Chinese scientists obtain the first molecular evidence of interbreeding between our ancestor ‘Homo erectus’ and the ...

Various purposes of sex, people go for, include: affection, attachment, bonding, boredom, closeness, comfort, commitment, communication, connection, continuity ...