SEX in public - many couples love to indulge in frisky behaviour while out and about.
Sometimes it is planned, a box ticked on someone's sex bucket list (or general bucket list).
And sometimes people just get so wound up they can't wait until they get home for a bit of hanky panky leading to some very weird places people have been caught having sex.
Recent popular choices have been by sea and mile high.
A pair of amorous thieves stole a moment of passion inside Cairns man's boat all caught on CCTV.
The footage of Tracey Bolton, 39, straddling Shaun Edmondson, 31, and getting frisky on board a Ryanair flight from Manchester in the United Kingdom to the party island of Ibiza last week has gone viral.
In the Far North there has also been reports of a couple busted having sex in a stolen car and on the balcony of an apartment building.
Unique Wellness psychotherapist Dione Keleher said the whole act of having sex in public was a bit superficial and there could be many reasons behind it.
"If it was a one off scenario, then it's more likely to be just moment of, let's just do this," Ms Keleher said.
One off public sex was more opportunistic, she said.
"More about the hidden rebelliousness, people wondering let's see if we can get away with it," she said.
But what about those who regularly have sex in public?
"If it's something you do regularly then there's a deeper seeded issues to it and that would depend on the individual's background," Ms Keleher said.
"If I person came to me and said my partner and I have had sex in public someone else's boat… the first thing I'd be saying is, how did that actually make you feel and why did you do it?
"I would try and identify the feeling behind it, was it about adventure, was it about being rebellious… or was it about doing something in front of other people because there's some part of you that likes to be watched or seen."
MTV listed 14 naughty celebs who like to have sex in public places and it seems the Kardashian's are leading the charge.
1. Khloe Kardashian... on a plane
2. Miley Cyrus... under a table
3. Chrissy Teigen... at obama's party
4. Kim Kardashian... at the cinema
5. Zac Efron... at his prom
6. Kourtney Kardashian... at the gym
7. Jennifer Lopez... on a balcony
8. Jake Gyllenhaal... everywhere
9. Hugh Grant... in a car
10. Zoe Saldana... on the subway
11. Christina Aguilera... at a family party
12. Kanye West... among the Italian scenery
13. Brad Pitt... at the royal albert hall
14. Lady Gaga... on the beach
According to nerve.com here are nine of the weirdest places people have been caught having sex.