Mier, my earlier post was an ill-considered answer. I've a fair bit on my mind at the minute. If I still have my wits about me I hope I'd have the gumption to book a one way ticket to Geneva where I could go with Dignitas.
Painlessly and not in a hospital bed.
A great aunt collapsed and died in the garden...one of my grandmothers had been pottering in the garden, sat down and died...that would do for me (although I dread to think how long it would be before someone found me in my garden!)
during sex (like Pope John XII) might be pleasurable, but perhaps not so nice for your partner. Apparently a Pennsylvania woman was electrocuted by nipple clamps.