I'll go down on a girl at any (any!) time of the month, and I think the discharge amount is different but not the "flavor"...like...thickness, etc....changes (IMO) but not flavor...the flavor is always good to me...
You can definately taste the iron. It's a bit metallic... can be a tad bitter...
You can smell the blood too, but it's not a "freshly drawn" blood or an "operating room blood" smell. It's a little more musty.
It's definately not putrid or rotting or anything, but I do think we're genetically programmed to be less aroused by the smell. You can still push right past it and handle your business tho!
Show her? Usually all the girl sees is what you saw in my tongue pic + my face...
I don't think she actually "sees" what I'm doing...
But like I said, I get a nice confused look every so often, just before the girl has another O...like...she's trying to figure out what I'm doing to get her there again..