Jack Fincham has confessed he lasts "10 minutes or so" in the bedroom.
The former "Love Island" star revealed how far he tends to go when he and girlfriend Dani Dyer get jiggy with it, after she had estimated he lasts around 15 minutes when they're having fun.
During a game of Master and Miss on "Celebrity Juice", host Keith Lemon asked Dani's father Danny Dyer to pose a series of embarrassing questions to the pair.
The "EastEnders" star asked his daughter how long it takes Jack to perform in the bedroom "to the nearest minute, on average?"
She replied: "Oh god, I don't know," and Jack said: "I can't even make a joke, I can't even make a joke. If I make a joke, he's there."
Danny then said: "You're only cuddling ain't ya?"
Dani nodded in agreement and then gave an answer of "15 minutes", but an honest Jack said it was more like "10 minutes or so".
Elsewhere on the show, Danny asked Jack what Dani calls her "lady bits".
The former stationery salesman said: "Mate, what?"
Upon hearing Jack's reluctance, "Football Factory" star Danny said: "Good, good f***ing answer, well done. Congratulations ... I like to think they're called "out of bounds" ... but I know they're not, so..."
Much to Danny's delight, Jack replied: "I ain't seen it, I don't know."
Jack previously admitted he bonded with Danny straight away, but is "scared" of his significant other's mum Jo Mas.
He said: "I'm more scared of Dani's mum."
Dani added: "She is a bit scary."
Jack and Dani got together on the latest series of "Love Island" after pairing up with each other on the first day and they went on to win the show.