seriously, gmail?

so i don't know exactly how gmail uses its advertisements. i know it has something to do with the contents of our emails. but i don't know whether it has humans or robots searching through the contents of our emails. all i know is this: about an hour ago, i sent an email to my friend kienan and in it, i included a joke piece of advice "don't wipe your nose with the tissue you used to wipe your ass." it's a weird joke and not all that funny. just supposed to be a play on "don't shit where you eat," or whatever that old adage is.
anyway, here's where it gets weirder. an hour later, the ad at the top had something about a "self wipe toilet aid." out of sheer curiousity i clicked and this is what i found: so i don't know what's more embarrassing; that someone (or something) is reading all my emails IMMEDIATELY after i write them ... or that they think i would pay 35 dollars to not have to wipe my own ass.