is an essential piece of furniture
because it is so dynamic
and flexible. It is good to lounge on and to just kick
back. Then you can have a friend
sleep over with minimal adjust
ment of other house furniture. (Hint: Try putting a thick velvet blanket on the futon as an under blanket...absolute heaven)
On the contrary, futons are somewhat hazardous to your health. They do not support good posture whatsoever! Any way that you try to sit in them, you either lounge (with your back as crooked as a question mark) OR sit completely upright and be uncomfortable as hell. Take you pick...spinal damage or unpleasantness.
Simple solution: When your futon is in the upright position, try putting a pillow behind the small of your back. Thus, straightening your back and preventing discomfort.