SEX DIFFERENTCES IN PARENTAL INVESTMENT
-human males can opt out of parental investment in a way that females cannot.
-Females invest more than males.. produce fewer potential babies than males do so they have parental certainty.
-Females breast feed their young so have a more extended period of childcare. Therefore have a larger pre-natal as well as post-natal contribution.
-FEmales have a particularly high cost of childcare with a minimum of 9 months which is much greater than the males minimum.
-A man can potentially father an unlimited number of children.
-Males are under pressure to protect themselves from cuckoldry.
-Females want to ensure good quality offspring so they don't waste their efforts. Woman may marry a caring man with good-resources but…