The female hanging fly will allow males that provide larger nuptial gifts to copulate longer, and in turn transfer more sperm, skewing paternity. Males providing insufficient gifts get flung off by the female before insemination is complete.
Anon: Dude, she's a female hanging fly. She’ll only mate with a male, when he brings her a caterpillar as food offering, the bigger the offering, the more time she’ll have intercourse with him. For insects it’s food for us it’s money.
Abak: You mean she is a gold digger!?
Anon: Hells yeah!