One version of a "planetary"-based symbol of sex (the sexes), using old "alchemical" colors (Mars=iron=rust=red and 
Venus=copper=patina=green -- see File:17101.gif / File:Rosicrucian Rose.jpg), offered as an alternative to en:Image:Unity XX-XY.JPG .  For alternative versions, see Image:Sexes-planetary-sym-dimcolors.svg and Image:Sexes-planetary-sym-pinkblue.svg , or (with slightly different symbolism) Image:HeteroSym.svg , Image:HeteroSym-pinkblue.svg , and Image:HeteroSym-pinkblue2.svg .
Own work
AnonMoos