Question Summary:
does a husband with two wives can sleep(marital relation) with both of his wives together?

Question Detail:

does a husband with two wives can sleep(marital relation) with both of his wives together?

Answer :

In the name of Allah, Most Gracious, Most Merciful
Assalaamu `alaykum waRahmatullahi Wabarakatoh
It is not permissible for a man to have relationship with both wives at the same time.
And Allah knows best
Wassalam
Mufti Ebrahim Desai
Darul Iftaa, Madrassah In'aamiyyah