Call me old fashioned but....surely all of this is where you should be having conversations and getting to know each other?

I suppose if you were engaging in activities with a paid professional it would be sensible to have a contract in order to eliminate any misunderstandings, but in a relationship/friendship etc, I think, one should always discuss and experience things before deciding if you like it...

for example...anal fisting could be great fun with one partner, but totally awfull with another depending on proportion and technique.

I'm afraid I dont believe, with regard to a checklist, that one size fits all, if you pardon the pun!