A father is the male parent of a child and has paternal bonds as well as legal responsibilities. An adoptive father legally adopts a child, while a biological father is the genetic contributor through sexual intercourse or sperm donation. A biological father may still have obligations even if not raising the child, while a putative father's biological relationship has not been proven. A stepfather is married to the child's mother but may not have full parental rights. The terms 'father' and 'paternal' refer to the male parent biologically determining sex through X or Y chromosomes. Related terms of endearment include dad, baba, and pop.