You don't belieive in discrimination, eh, Keith? So what's this, then?

Marriage is available to all as it is currently defined

Which means:

"Marriage is available to all as it is currently defined, including to homosexuals as long as they deny their natural sexuality and find a partner of the opposite sex to marry."

As currently defined, marriage is unavailable to homosexuals who refuse to deny their sexuality by marrying a partner of the opposite sex. On the other hand, heterosexuals may enter into marriage without denying their sexuality. That is treating people differently. One group has it better than the other by design. By any measure, that is discrimination and you appear to condone it. You may think that's trivial, Keith. A piece of piss for a gay person. Well that shows how intolerant you are and how little you understand same-sex relationships.