How can banning incest in New Jersey not be a manifestation of sexual hypocrisy?

So long as a woman marries her father, even if she has children by him, but she doesn’t marry her son and have children by him, removing the biological disaster claims, why should she be denied? If she is over 18 and consents to marry and have relations with her father as he with her, why should they be thwarted because it makes people uncomfortable? To say it is unnatural more than other forms of coupling these days would be rather hypocritical.