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The Westermarck Effect suggests that people raised in close domestic proximity during early childhood (before age 6) develop a mutual sexual aversion. However, if step-siblings meet as teenagers or adults, that aversion never develops. In fact, they may experience — an intense attraction between close relatives who meet as adults. Since step-siblings share no DNA, GSA can be even more confusing because society treats them like siblings, but biology does not. step siblings caught 30