People need to get over the idea that marriage is only about sex. And if gay relationships bother them, they need to stop trying to visualize what a gay sexual relationship looks like. Instead, visualize the partnership that is legalized, in which the couple may share in benefit packages from the workplace or elsewhere, equally own real estate, have no confusion as to who is a legal heir or who is "family" who may visit in the hospital and make final decisions. A stable partnership in which to raise children - however conceived - and not have to explain the compromise legal agreement they have reached regarding adoptive and custodial parents.

Close family relations are universally banned from marriage, due to their sexual behaviour, which is deemed to be dangerous, unhealthy and socially unacceptable. The health issues could be overcome by close relatives agreeing to be sterilised, yet this piece of equality is never discussed.   The ban is quite rightly in place for social and legal reasons.

Comparing gay sex to sex between siblings or first cousins is so flawed an argument it doesn't bear dignifying it with a response. Apples and oranges would be outraged to be markers for such a debate.

It's time to let go of that health and welfare syllogism, it is a specious argument flogged to death through dozens of threads and proven to be inaccurate on many occasions.