In contemporary slang, "leg" imagery appears in several ways:

In the Middle Ages, "leg stuff" (intercrural sex) was a popular alternative to full intercourse. It was frequently used as a , allowing couples to be intimate without the same risk of pregnancy. However, it wasn't exactly "church-approved"; the medieval church often categorized it under the broad umbrella of sodomy because it didn't involve procreation. 2. Ancient Origins

Here is an "interesting report" on the history and cultural impact of this specific practice: 1. The Historical "Safety Net"