Forms of BDSM play I've thought about working into a play exam include:
The use of restraints, both to limit movement as well as to provide access. For example, fixing my arms behind my head and to the exam table. Also: restraining my thighs to the table so that they stay pressed to my chest, allowing the doc to easily perform a thorough rectal exam.
The use of a catheter. Lately I keep coming back to the idea of being catheterized at the start of the exam and have to endure the awkwardness of having a rubber tube hanging from my penis, but also the embarrassment of giving up control of my bladder to the doc. (Of course, he can keep the catheter clamped off or attached to a bag as his own discretion.) I also like the idea of simultaneously having to submit to an enema--the idea of fluids being both inbound and outbound.
The use of e-stim. Fairly self explanatory? (And this I've done.)
The use of an anesthesia mask. While I'm not interested in forms of play that would restrict breathing or air flow, I like the idea of a trusted play doc being able to influence my heart rate and to relax my body.
In the category of things I'll watch online but would probably never do myself: saline scrotal infusion. From what I've read, it's a unique sensation, but forms of play that involve needles or blood have always been a no-go for me.