OK, we're all over the arrival of The 13th Step today... Several folks who have been to AA have mentioned how totally inappropriate it is to name a bar The 13th Step.
From the AA glossary of terms:
Thirteenth Step (a.k.a. Thirteenth Stepping):
There is no thirteenth step in the AA program. This term is used as a euphemism for inappropriate sexual advances by a member to a newcomer in AA (such as sponsors toward sponsees). Sponsors ought never be sexually involved with those whom they sponsor. This is why it is usually suggested that (heterosexual) newcomers choose sponsors of the same sex, thereby avoiding the temptation. Also, it is sometimes suggested that newcomers not enter into new relationships for at least a year after getting sober. The reason being that sexual relationships are prone to elicit emotional extremes, making relapse more likely. The term 'thirteenth stepping' is always used in a negative sense.