I'm all for everyone involved having a few cold ones, then towards the end of the evening casting spiteful accusations at one another about who's fault it was.

But if that doesn't fix the problem (and I've been told that for some reason it doesn't work very often), talking it over's always a winner. I mean it sounds like the plan went south because things just weren't conducive to the general mood, not because the plan itself was necessarily a dud. You were tired, he was tired, the long drive and the work stuff and a whole bunch of other crap wasn't exactly helping the mood... The best bet's to have a bit of a chat about it, come to the agreement that it was doomed to be a write-off, and decide whether it's still an interesting enough idea to try doing right some time. Then once you've got some form of consensus about it being no big deal and a nice optimistic gameplan to get something kinky happening when you've had time to plan it and everyone's batteries are recharged, then you can get down to the serious business of having a few cold ones and casting spiteful accusations