Probably a bad idea.

I think where you'll have trouble is convincing any provider to snort some random powder you bring to the session. For all she knows it could be rat poison. I think just suggesting such a thing would get you added to the "never will I ever" list... not because of the sneezing thing, but because she'll probably think this really isn't about making her sneeze. Can't say I'd blame her for being extremely suspicious. I know what you're thinking: What is this world coming to you when you can't trust strange men who ask you to ingest unidentified substances? But such is the world we live in. I imagine it's also difficult to convince a woman to meet you at a remote location somewhere on an unmarked route off Zzyzx Road, even if you assure her the shovel, duct tape and donkey mask are just part of your shovel, duct tape and donkey mask fetish.