Interdingle
Fornication with each other in large groups. i.e; or having sex within your siblings like the Greek Gods.
So we all know of the mother Earth, Geae. Well she had sex with her son Urunos and convieved 12 children. Well they had nobody else but their blood siblings to court with. Like Hyperion with Theia conceiving Helios. Mnemosyne interdingles with Zeus and on goes the crazy sex chain the Greek Myths. (no offense to those who love that Greek stuff, i find it fascinating if you cant tell from the specific awsome names!!! ;) )