I've had a guy email me on AW before, asking me to shit in his mouth, while he shits in my mouth & then kiss to swill it all together!
I declined & blocked him immediately.
A more recent request was to save up used condoms from other clients, knot them & stick them in the freezer for a booking where the guy wanted me to dump them out on his cock & use the contents as some sort of lube for a handjob.
After a message telling the guy how ridiculously unsafe that would be, I blocked him.
Last night during a cam session, a guy asked me to pick my nose for him. I obliged, but declined his request to eat the boogers for him.
He stopped the session after that.