They argue against things like bestiality and pedophilia based on definitions of consent but they cant avoid having to accept them as orientations once they accept self perceived homosexuality as an orientation. The basis in genetics and physical characteristics is all equally absent. The lobbyists for those things will exploit that of course.
I'm not really sure what the benefit is to marrying the robot???? There will be no transferal of benefits, nor common acceptance of their relationship. Makes no sense to me whatsoever.