Gleb Savchenko claims other "Strictly Come Dancing" pros "could well" be making out with contestants - after Katya Jones was caught smooching Seann Walsh.
The "Dancing with the Stars" pro - who previously worked on the BBC show - suggested other incidents may be happening away from the cameras, but he insisted Pasha Kovalev, who is dating his former "Strictly" partner Rachel Riley, would never cheat.
He said: "We've seen Seann and Katya making out outside a bar and if you asked me if I think people like Giovanni and his partner or any of the others are making out when no one is seeing it, I cannot answer that question. It could well be happening.
"They may have hooked up even before Seann and Katya.
"You know the only person who will never have a "Strictly" curse is Pasha.
"I think no matter who you give him he will never ever, ever have any attraction or anything, not even a flirty moment because he's such a reserved guy.
"Even with his partner Ashley Roberts, she's super-cute and super-hot - if you were single you'd definitely hook up with her, but he's got a girlfriend and there's no way he'd hook up because he's also very conservative too."
The 35-year-old hunk admitted a lot goes on behind closed doors and while dancers may not necessarily be looking to get with their celebrity partners, it does happen.
He added to The Sun newspaper: "A lot of stuff happens secretly that we don't know about.
"It's obvious the dancers have feelings - it's not necessarily that they want to go and f**k them but a lot of people do.
"It's normal if you're single but if you're not single then OK, you've taken that a bit too far.
"I know from the past that these things happen and people get married and even stay together from the curse - it happens."
Gleb's claims come after Katya and Seann were pictured smooching outside a central London bar, despite her being married to fellow pro dancer Neil Jones, and the comedian having a girlfriend of five years, Rebecca Humphries, at the time.
While the pair publicly apologised for their "one-off mistake", Rebecca dumped Seann and took their dog.