Licking it off of him (or myself), having it on my body...non-issues. It's the sudden rush of hot liquid into my mouth (I think this is why I don't drink coffee too..heh)....and I suppose if it tasted like chocolate sauce, we wouldn't be having this conversation.
However, maybe the cornstartch mixed with water and then placed into a syringe and then shot into the mouth would allow you to "practice" by yourself at home...

(I'm soooo trying this, btw) LMAO