Take your loving from the stairs, and make them last

The story:

Self realisation dawned on me when I heard it on the radio. Thankfully I was on my own when I realised, but then realised that I'd probably sung along to it in the presence of others with 'my lyrics' at least once. I did wonder what the hell the stairs had to do with anything but it hadn't crossed my mind that the stairs didn't come into. The most I'd ever taken from the stairs was an old nail!