The groups said contestants including solo singer Austin Drage and boyband JLS were constantly removing their shirts even when it was cold.
"All the buff lads are always walking around without their tops on," said Sophie from Bad Lashes. "We're just used to it and we're saying: 'Leave something to the imagination please!'
"It will be freezing in the kitchen and they still in there shivering with no top on."
GirlBand's Phoebe Lau commented: "There are no distractions in the house. The only distraction is that they walk around with their tops off. It's boring
"The first couple of days it was like, 'OK, that's cool', but now we say, 'you've got a bit muscle, put it away!'
"They're really nice guys but we see them like brothers. They're not boyfriend material."