Slang: SRC
Is a sexual position which needs 8 people perform a perfect symmetry of a sexual act connected by dildos.
Position:
2 men are fucking 2 women anally in a reverse cowgirl position on the floor. The 2 men also have a double ended dildo in their anus' while the women also have a double ended dildo in their vaginas. The 2 women are giving blowjobs to 2 other men, while the 2 men with the double dildos are being facesitted by 2 women.
You would only see Symmetric Reverse Cowgirl in a porno.