>Is there a counterpart (male) for "shrine maiden"?
The structure and history of Shinto priesthood is more complex than a simple "yes" can express, and my knowledge is also quite limited on that front. But of course there are male Shinto priests. In the modern Shinto system, "shrine maidens" are in fact not even considered properly registered and trained priests.
>Make it one drink , and one consumes the drink.
>Make it two drinks, and the drink consumes itself.
>Make it three drinks, and the drink consumes one.
That's simple proverb-ish humor. After two drinks, you are starting to become intoxicated, and the liquor seems to automatically drink themselves. After three drinks, you get smittened, "the alcohol drinks you".
>The Hakurei Priest
This is something not as well-known as it should be in the Western fandom.
ZUN calls himself the Hakurei Kannushi, and sometimes signs his writing with it. "Kannushi" originally refers to the male chief priest of a Shinto shrine, and today is used to refer to all male Shinto priests. Fans, including ZUN's friends, often call ZUN "Kannushi" to show respect.
A fan has carved a Hakurei Kannushi stamp for ZUN. This seal can be seen on all official books.
Previously I said in the status update thread that ZUN first called himself that in IN's credit roll, this is incorrect. The earliest instance of this title I know of is on his music download web page from 2001, where he called himself "the Kannushi of this shrine".