It's for some people and not for others. I think ideally most children prosper under the care of at least a mother and father, if not an extended family, which is the way people used to be raised prior to modern nuclear family structures.
As for evolutionary biology, there are plenty of women that don't seem to be all that discerning when choosing a mate. And for monogamy, my guess is that women cheat nearly as much as men.
According to this article
http://english.pravda.ru/society/sex...-sex_tourism-0 600,000 married women travel to various countries (Southern Europe, Carribean, etc) to have sex romps each year.