The group, who have recorded their own versions of tracks including Billy Joel's 'Uptown Girl', Barry Manilow's 'Mandy' and Phil Collins's 'Against All Odds', confessed that they have made a lot of "mistakes" in the past.
Band member Nicky Byrne told The Sun: "We've certainly made a lot of mistakes. We've recorded songs that we should never have recorded. We look back on some of them and think, 'Oh God, that was terrible'.
"Sitting in rooms and nodding our heads and doing everything that was asked of us was what we did for years and years. But we are happy to speak now, to say, 'I think we should do this'. We've become men over the last few years."
Shane Filan added: "You get to a stage when you get a bit lazy. But then we'll go back into the studio and realise the last record was a bit lazy and do better on the next one."
The band recently revealed that they plan to record more "sensual tracks".for their next album.