In principle, contacts between men and women are not totally rejected; rather, they are recommended as long as the intentions are pure and the subject of conversation is lawful and involves either beneficial knowledge, good work, charitable project, jihad, or many other deeds that require efforts and cooperation from both sexes.
However, this by no means calls for the transgression of limits or forgetting about the nature of both sexes. In all their dealings, both men and women should abide by the teachings of Islam that call for cooperation on the basis of goodness and piety, while at the same time, they should observe the rules of morality and politeness.