Is it permissible to engage in sexual intercourse with more than one concubine simultaneously?

It is permissible for a man to have intercourse with two or more of his female slaves in one night. However, having intercourse with one of them in the sight of the other is forbidden or disliked, and the more correct view is that it is forbidden, even if they both consent. This is provided that the 'awrah is covered; otherwise, it is undoubtedly forbidden.