Is it wrong to fall in love and have a relationship with your first cousin even

Is it wrong to fall in love and have a relationship with your first cousin even

Is it wrong to fall in love and have a relationship with your first cousin even if you did not grow up together and met as adults? There are many taboos about this kind of relationships and some cultures see it as a very bad thing and others don't. I am very curious to know what philosophers have to say about this.

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