Bed Bugs love a gap, a slit, a crack or a hole in a wooden bed frame. Natural wood surface that is devoid of any stain or paint feels natural to Bed Bugs. Also, a bed bug nest in such a place is very safe and hidden.
Metallic only bed frames offer very few of these nesting opportunities. Particularly, the bed frames that do not require a boxspring are an effective defence against bed bugs.
An addition of a bed bug cover for your mattress, would increase your defences against bed bugs!
Click on the picture to see the full resolution image.