SANTA ANA (CBSLA.com) — Valentine's Day began as a religious holiday, but a grass roots group claims "atheists make better lovers."

To press their point, Backyard Skeptics put up a billboard in Santa Ana that promotes a godless Valentine's Day.

It features a picture of a pair of feet under bed sheets.

The caption reads: "Atheists make better lovers (after all, no one is watching)."