What are the greatest mysteries of our time?
Ella Eyre's hair?
Liam Payne and Mrs Cheryl's relationship?
The Real Housewives Of Cheshire?
They're all good but what we're specifically thinking of is: did Olivia Walsh and Gary Beadle actually have sex during filming of Ex On The Beach?
It's been debated at length by Jemma Lucy and Olivia in the house, with Jemma claiming that they did, and Olivia saying that they didn't.
"Has his dick been inside you?" Jemma asked Olivia, with all the subtlety of her lips.
"I shouldn't have to explain how many f*cking seconds his dick's been inside me," Olivia bit back.
"It could've been an hour, it could've been a second. Who f*cking cares?"
Gary doesn't seem clear whether or not Olivia will join the list of over a thousand women he reckons he's boned, saying: "I turned over in the middle of the night, she's wet, I'm naked, it literally – I'm talking that much," describing with his fingers in the shape of the OK sign just how much of his parsnip was involved in the alleged sex.
Now, FINALLY, Olivia and Jemma have spoken out, clearing up the argument once and for all.
"Me and Jemma have been arguing about whether a penis being inside you for a second – or ten seconds - is sex or not," Olivia told MTV's Shack of Secrets.
"It's NOT sex….
"If a penis enters a vagina for one second, how is that having sexual intercourse?"
Jemma, however, feels differently.
"You've had just as much dick as I have," she said.
"Just because I've been pumped 30 times more than you did doesn’t mean you didn't have sex."
Hang on – we thought Gaz made her climax eight times. That's more than once per four pumps. Blimey.
Jemma goes on: "Look up in the dictionary 'sexual intercourse' – when the penis enters the vagina."
So, we did.
The dictionary says: sexual intercourse (noun) genital contact, especially the insertion of the penis into the vagina followed by orgasm
So, not definitive at all. DAMN YOU, DICTIONARY. Now we'll never know.
Want to watch Olivia and Jemma's behind-the-scenes spat? You can.
*Ex On The Beach continues on Tuesdays at 10pm on MTV. *
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