Obvious benefits of female promiscuity across species

The endosymbiosis theory
June 21, 2017
Design a monitoring and schuduling program for irrigation
June 21, 2017

Some of the more obvious benefits of female promiscuity across species, from jacanas to field grasshoppers. What factors seem likely to have driven the evolution of female promiscuity? (Please give examples of humans and other species of organisms, even insects.