On top of this, it is forbidden for men to see a women in privacy or without her mahram relatives, which is stated by the Prophet Muhammad (may peace be upon him):
>"Do not visit the women whose husbands are away from home, because Satan circulates in one of you like blood" (tirmizi)
(a mehram is basically anyone whom it is permanently forbidden to marry because of blood ties, marriage ties or breastfeeding, so for example: your mum)
To top that up, there is a tradition from Jabir where the Prophet Muhammad (may peace be upon him) states:
>"Whoever believes in Allah and the Last Day should never visit a woman when alone unless she has a mahram relative also present, because the third one would be Satan" (Ahmad)
>“When a man and woman are alone together, Satan is the third.” [Tirmidhi]
I don't think it gets any more clear, but let's continue.
There is a hadith where the Prophet Muhammad (may peace be upon him) states:
>"No man should visit the other woman when she is alone unless she has a mahram also present, and no woman should travel alone unless accompanied by a mahram" (Bukhari)
The definition of a mehram is basically
Its very clear that if a man wants to communicate with a women, there has to be a mehram present.
Let's go further.
There was an incident where men and women were walking side by side in a crowd, of which then the Prophet Muhammad (maPost too long. Click here to view the full text.