It is narrated from Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) said: A man should not look at the 'awrah (private parts that must be covered) of another man, nor should a woman look at the 'awrah of another woman. And a man should not lie with another man under a single garment, nor should a woman lie with another woman under a single garment.