How does same-sex marriage spread?

Yes. I suppose that is the only meaning it could have, but that idea is more often expressed as anti same-sex marriage.

The law determines who can marry and whose marriage will be recognized. Therefore, marriage and the law are inextricably bound together.

Generally, a gay couple files suit in court. Legislative action might follow. After numerous court challenges, bills legalizing gay marriage were passed in most of the provinces, starting with...

Gay marriage benefits: Gay/lesbian people. People who are for equality for all. Everyone. Gay marriages tend to have fewer children. Therefore, overpopulation is slightly slowed by having more gay...