Culturally and environmentally, what are the pros and cons of sending your children to a co-ed school?

I'm a huge proponent of co-ed schools. The real world consists of women and men so why deprive children of interacting, working, communicating with the opposite gender just because they are in school. If one is worried about the so-called cons (inappropriate interaction, sex-related), opportunities like these can occur in all-boys or all-girls schools too.