Mating

Human mating
"Women seeking romantic partners seem to prefer men already chosen by another lady. It’s a notion ingrained in pop psychology, but actually based on the scientific hypothesis that heterosexual women practice “mate choice copying.” That is, females save time and energy finding a worthy mate by selecting one previously picked by others.
Researchers have documented mate choice copying in animals from rodents to birds to fish. But whether humans do it is more ambiguous." 
— Discovery, 2019