I practically grew up in an RV. My dad had a job that provided so much vacation that he always counted it in months instead of weeks. Every summer, and some winters, we would pack a family of 6 into an RV of some sort and explore the nation.
Now that I'm grown, I am on my third RV. The first was a pickup camper, and even though it was a larger model, there wasn't really much room to do the nasty.
My second RV was a 36 foot bus motorhome that I bought for my traveling consulting business. It had a king bed in back and a "conversation pit" style living room in the front. The pit, as we called it, easily converted to a big padded adult playpen. I had 4 different girlfriends join me for sex in the "bus". I also met a woman online and drove to her town where we had stranger on stranger sex in a strip mall parking lot. (let's just say that there was shaving involved and lots of video. And I'm still kicking myself for not backing up that PC.)
The RV I have now is a 27 foot 5th wheel. My wife and I have had several adventures in that unit, and we have actually traveled in it as well. Later this month we are going to baseball spring training, and taking the 5th wheel. A girlfriend of my wife's, whom she had a brief relationship with, is meeting us there and staying with us. I'm hoping to pop my RV threesome cherry this month.