Non traditional locales

I recently watched one of the earlier episodes of Big Bang Theory, in which Penny's boyfriend at the time had written a blog about their sex life. At one point Leonard mentioned that she was just expressing her passion in "non traditional locales" and that got me thinking: what non traditional locales have couples expressed their passion in?

Personally, I've only had sex in the privacy of home or hotel (you both have to want to be more adventurous), but I'm sure there are some people who've had the pleasure of doing it elsewhere and I was wondering if you'd all like to share.