It is absolutely clear that Islam does not allow men and women to meet each other unless Mahram whenever and however they like. It has placed clear regulations and restrictions upon such behavior and has defined the limits of interaction between men and women. Moreover, Islam has closed all doors that lead to temptation and promiscuity.
How to Deal with Free Mixed Functions E.g. Marriage (Mehendi) or else - Maulana Ishaq r.a
