Beds are important in romances. This is particularly true of sexy romances, where getting someone into bed is a euphemism for having sex. Certainly beds are a lot more comfortable for intimate activities than prickly bushes or sandy beaches or swinging from chandeliers. (That last must require the skills of an acrobat!)
Even in sweet romances, sharing a bed is a symbol of marriage and partnership. All true and important. But what happens when the excitement is over and actual sleeping is attempted?
Sharing a bed can be very complicated. Partners who snore or who flop around like a fish on a hook can lead to sleeplessness and ruin your next day. That can lead to separate bedrooms no matter how fond people are of each other.