The more closely related to you a female is, the larger her breasts have to be for you to be enticed to get all incestual with her. As it is generally frowned upon in most cultures to bome one's sister, said sister's breasts would need to be the size of basketballs in order to tempt one into doing so. However, a fourth cousin twice removed might have non-existent breasts, but one would have no qualms about shagging her, as the two parties share only a dash of genetic material (in her vagina).
'Dude, Einstein's theory of relative titty is definitely factual as no sooner had Mum had her double D boob job, then I was on top of her sending my penis back from whenst it came (her vagina). Then I came.'
by Anonymous submissions December 06, 2017
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