It's a sign!

Unaccustomed as I am to obey every instruction given to me by way of billboard advertising, on my way home from the party the other day (by way of the night bus), one caught my eye, not least because it was yellow with bright red writing, but also because the letters were about five feet high each.

It didn't even appear to be advertising any particular product - there wasn't anything except the text:

MAKING LOVE?
DO IT AGAIN... AND AGAIN!

Yes, sir!