I had a very petite girlfriend a few years ago, she was living with a female co-worker at the time and staying in a spare room. Her temporary bed was a metal-framed "day bed" with rails on both ends and one side.
The second time we fucked, I was on top with my hands on the head-board rail for support. She was so hot, tight and wet I was going crazy pumping her like a mad-man. When she started cumming, her hips were bucking up and down, and her pussy started contracting around my cock. That sent me over the edge, and I came so hard I broke the head-board rail off the bed, causing it to collapse...
Niether of us got hurt, and we were both so spent from orgasm all we could do was lay there on the broken down bed. Her housemate was alarmed at the noise from the bed crashing down, and rushed in to the spare room to see us knotted up, sweaty and panting like dogs on the collapsed bed.
Twice more that bed collapsed while we were fucking, until we moved in together in an apartment and got a real bed. I still have many good memories of that little day bed, the rails had lots of interesting uses, especially for a little bitty thing into sexual acrobatics :smile: