To be fair, I have two adult cousins. One of which I was raised with and saw regularly. I can say she is attractive, even sexy but I just don't have any or very little arousal from her. I have another cousin, who is actually closer biologically, but I never saw much of my young life and I find her very attractive and arousing. Which would be anecdotal evidence of the Westermarck Effect.

Next 20 years eh? It would be hilarious if we were both posting here still!