Bykea Sitting With A Na-mehram
There is no such thing as you heard in Deen. What the prophet did is actually according to Deen. So you should correct your knowledge with the action of the prophet. Touching lustfully is obviously forbidden. Otherwise the women in the time of the prophet used to take care of the injured men during war and transport them to their homes. Men and women used to visit each other like normal social interaction. Women participated in all the economic activities. A woman named Shifa was appointed to supervise the market. For detail you can read the social activities of the women in the era of the prophet in the book of Dr Mazhar Yaseen Siddiqui, ‘Rasul e Akaram awr Khawateen: Aik Samaji Mutalah.’ Available online too.