hm.
i just realized that i never did answer this question.
although if in the right mood- everything can be a turn on...
really my MOST VANILLA- assuming you want an answer
besides "a hard cock" because really that is HIGH on my list,
would have to be a solid, deep voice.
not quite like Barry White-
but a low tenor or any bass growl-
a firm "LQ, cum for me" in my ear would just about.....
okay...
umm....
yeah, that'd do it.