Heterosexual symbolism dates back to the earliest artifacts of humanity, with ritual fertility carvings and primitive rock art.
This was later expressed in the symbolism of fertility rites and polytheistic worship, which often included images of human reproductive organs. Modern symbols of heterosexuality in societies derived from European traditions still reference symbols used in these ancient beliefs. One such image is a combination of the symbol for Mars as the definitive male stereotype of a warrior, and Venus, the Roman goddess of love. The unicode character for this combined symbol is ⚤ (U+26A4).