sentences:  Despite this, females do seek out extra pair copulations, and, because of the risk, there is more debate about the evolutionary benefits for females.Extra-pair copulation in men has been explained as being partly due to parental investment.Research has suggested that copulation poses more of a risk to future investment for women, as they have the potential of becoming pregnant, and consequently require a large parental investment of the gestation period, and then further rearing of the offspring.