What do you use to attach your bondage d ring cuffs to the bed head?

It depends on the type of bed that you have. If you have a wooden fram and you don't mind altering it a bit. I drilled pilot holes and then screwed in some lag eyebolts. (actually did this into the wooden corners of my box spring. from the eyebolts you can now use chain (with quick links or even padlocks) Or you can use rope.

If you have a metal frame. You may wish to also drill a hole through the metal where you can then attach an eye bolt Or to protect the metal.. stick with rope. The advantage with the bolts is you have a fixed point of bondage as opposed to rope that could slide (ie along the length of a post) It all depends on how you tie or chain someone up.

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Use a strong rope or some elastic if you want to create an amusing effect

I think a shark in general would be good enough. Why not just give you a lazer beam (LOL. I sure could use one to justify my Evil Mother.

Why not use ties, rope, or any household objects?

I'm glad you guys are exploring this, it's fun.

Or you can use stuff you already have like belts, ties, scarves, etc.

Do you know nylon cable locks? Try them. Their pretty good.