There is a time and place for forgetting as well as remembering the OTR designers argue that even business negioations are frequently undertaken informally. Indeed, often intoxicating liquids are consumed, which serve to improve denyability.

But, you should not sign the contract while drunk! SSB is designed for sober usage. However, another protocol (that even utilized ssb identities) could be bootstrapped on the side, and optimized for drunk usage, we just havn't gotten to that part yet.

Reportedly, in ancient persia, when making a decision, they would discuss the matter while drunk, come to a decision, but tomorrow when they were sober again, consider the matter again, and if it still seemed like a good idea, the decision was finalized.

source: https://skepticalphilosopher.blogspot.co.nz/2009/09/persian-strategy-deliberating-while.html