We all need space. Man’s inner nature is freedom. When I say man, I mean both man and woman, mankind. Just as you need free mental space, you also need free physical space.
In fact, I find the idea of a shared bed quite vulgar. The double bed is an invitation to trouble. The double bed makes it mandatory that you will necessarily sleep next to the designated person. Now, this can never be a mandate. There must only be single beds and preferably in separate rooms. When you want to meet, then only you should meet, as lovers do. Sometimes they decide to be in union.