The Geordie Shore star, 28, gives the cameras a cheeky (censored!) flash of his privates in a preview of the third episode of EOTB before heading to bed with Olivia.
"Gaz is going to show me his parsnip again," she says.
"I've never seen anything quite like it. It needs its own post code!"
This year's Ex On The Beach is all-star series so it features memorable contestants from previous series. Gaz appeared in the second series, while Olivia was on last year's fourth run.
Gaz and Olivia's bedroom antics have received a LOT of press since the show filmed in Thailand earlier this year, with rumours they'd enjoyed a threesome with co-star Charlotte Dawson in the penthouse.
We FINALLY caught a glimpse at what *really* happened in last week's show, when Gaz and Charlotte headed to bed, bumped into Olivia, and invited her to join them. The cameras showed the three in bed under the sheets kissing.
And that is ALL that happened, according to them.
"Me and Gaz got a bit frisky and we got Olivia involved," said Charlotte, "but it was just a three way kiss, it wasn't a bloody threesome. I think I more enjoyed kissing Olivia than Gaz."
Gaz added: "I'm in bed with Charlotte and Olivia, necking on with them... they're starting to grab my d**k a little bit, having a bit of a rub, but no. I am a good boy. I'm going to go to bed and I'm going to go to sleep."
Only until the next episode it would seem!
Ex on the Beach continues on Tuesday 30th August at 10pm, only on MTV.
Watch the preview!
Ex On The Beach 503 | Gaz, Hawley And Bear Get Lucky
Watch More: www.mtv.co.uk/ex-on-the-beach