Always wear clean socks...
I met my girlfriend at Disneyland in California when I was travelling in the States last year. We had a great day together, followed by a couple of cheeky drinks and a romantic walk through the Disneyland Resort gardens and a spot of making out by wooden cut-outs of Disney characters.
As the night was coming to an end she said something like 'Right. We'll go get my car, find somewhere to fuck and then I'll drop you back where you're staying.'. Hard to argue with that..
We drove down a side street somewhere in Orange County, pulled over, climbed into the back and got down to business. Only problem was, since I'd been travelling for a few weeks, I had no clean socks left and I knew for a fact that as soon as I took my shoes off the stench from my feet would totally kill any mood that there was.
Ended up just leaving my shoes on, pants around my ankles so I couldn't really move my legs much, and fucked like a retard. Not my best work, but she seemed to enjoy it, and a year later (next week!) we're still together and have had much better sex since.

Quick couple of others..

In a concrete drain pipe between Hamilton and Tarington on Christmas day a few years ago. Drunk.
On the Dalesford Primary School oval during Mardi Gras. Drunk.

On the playground at the Port Fairy caravan park. Drunk.

Pigeon Park in Vancouver, while homeless people slept on the next bench. Very drunk.

A few more, but I don't want to admit to them..
(r0ach, Fri 24 Apr 2009, 6:51, Reply)