I think it's about their past career and things they've encountered...and a testament to the fact they still have rock left in them and won't stop. They could also be referring to their music career as a relationship with woman, thus the sexual references in lyrics.
I think it's about their past career and things they've encountered...and a testament to the fact they still have rock left in them and won't stop. They could also be referring to their music career as a relationship with woman, thus the sexual references in lyrics.