This debate will not be productive. It is clear that pederastic relationships are not the same as modern day homosexual relationships. You can shroud the concep

This debate will not be productive. It is clear that pederastic relationships are not the same as modern day homosexual relationships. You can shroud the concept all you want by applying an overdose of cultural relativism, but that doesn't make them the same. For example even though what adulthood is may not be clear to you, evidently it was clear to the Greeks since relationships with boys were OK but relationships between adult men were not. I believe the Greeks themselves looked at the body of the boy: if the boy was getting bodily hair, then he was no longer fit for a socially acceptable pederastic relationship. Of course there is a gray line. Every concept has grey lines. That doesn't mean that the concept (like "adulthood") doesn't exist. Gender is actually a good example to illustrate my point. You claim that gender is based on cognitive processes, and I agree. That doesn't mean that there are not extremely strong biological influences on gender. You focus only on outliers, and ignore the bulk evidence. Gender is clearly strongly bimodally distributed and highly correlated with biological factors.