Biological instinct in female to seek out a mate outside of the group.

Generally the theory that sexual aversion is due to shared upbringing in early childhood (the Westermarck effect) is seen as competing with the theory that such aversions have an innate genetic basis.In other vertebrates there is some evidence that olfactory cues alone can act as a signal of relatedness, even for a sibling which has not been raised with the test subject (Mehlis et al., 2008; Boulet et al., 2009).TTFN,WK

Care to substantiate any of those highly contentious statements with anything even remotely resembling evidence?Your entire premise seems to be built on a tenuous web of unstated assumptions. One key one seems to be that one must be exclusively homosexual or heterosexual, another that those who are homosexual forgo all interest in having children.TTFN,WK

That is what makes them unstated assumptions, but if you don't believe those things then what is the rationale behind saying that ... Was it just a crazy non sequitur that popped out of your brain for no reason at all?Perhaps if you were to actually substantiate your claims as I suggested then we wouldn't have to play a guessing game of me trying to work out why you say apparently ludicrous things.TTFN,WK

Sorry IAJ, I just can't make head nor tail out of what you think you are saying. This seems to be bordering on a word salad.You simply claiming that something is a fact doesn't actually make it a fact, and your resistance to providing any source to substantiate your supposed facts is less than helpful in terms of making progress in this discussion. Making a coherent argument?TTFN,WK