Beyond the obvious literal meaning of the phrase related to anal sex, can be used to describe any situation where one party attempts to get something that would not necessarily be considered permanently off-limits, but would be considered completely inappropriate and out of bounds to request from a first meeting with another party. Especially fun when used in a business reporting context.
Businessman A: Wow you sure did get a lot of extra info about that deal proposal from your meeting at Company X, you must have a great rapport with them. Did you happen to ask them about the results of that other super-secret deal they did with Company Z?
Businessman B: No way dude, I don't go for anal on the first date.
Businessman B: No way dude, I don't go for anal on the first date.
by Grind S. December 18, 2013