The phrase "the missionary position" is often used to describe a sexual position in which one partner lies on their back while the other partner lies on top. However, there are several different names for this position depending on cultural or colloquial contexts. In some parts of the world, it's also called the "man-on-top" position or simply the "classic" position. In slang, it's been called "vanilla sex" or "the old in and out" and some refer to it as "the traditionalist" position. Ultimately, the name used for this position can vary depending on local language, slang or personal preference.