Great video. Funny how few people bothered to watch it. Another point is that if we were not somewhat related to one another, we would not be able to procreate because of genetic divergence.
Depends. If you are sexually attracted to someone closely genetically related to you, that's a psychological problem. If they're genetically different, like only being distantly related, then there's nothing wrong with it. After all, we're all related in some way or other...
http://www.ncsl.org/issues-re...
...only first cousins should be allowed to marry.