The reason I love to do this is because I believe that design should work with the way you live, and often men and women and husband and wives live differently.
I'm currently working on a bedroom design for my parents. It's so great designing for my parents because I really understand how they live. My mom always has stacks and stacks of magazines on her side of the bed (like mother like daughter!!!), and my dad has his computer, bills and a classical guitar on his side. I'm working on doing a desk on my dad's side and a three drawer dresser on my mom's.
But I'm not the only one who likes mixing bedside storage. Here are some other inspiration pictures of the same types of set up [you may have to look closely]:
via cote de texas
Of course, I love a completely symmetrical bed, too.
via lonny mag
The key is to choosing what makes the most sense for you.