Should Married Couples Have Their Separate Rooms?

One of my aunties was complaining to me that her hubby gave her a separate room in the new house they pack in recently, citing her having many clothes, shoes and other feminine accessories as the reason. She's arguing that as a young couple, they should be staying in one room.

When the issue came up as I was having a chat with her hubby, he maintained that the separate room is just for his wife to have room for her numerous accessories and that he sometimes need to be alone. He however said that the wife sleep in his room almost all nights and all what not.......
But should married couples have their separate rooms?