Blacks gaining rights was done primarily via constitutional amendment and later civil rights acts, all passed by the legislative branch. Some believe the courts did in fact go too far during 60s.

Women I believe were always allowed to work, so I'm not sure what this example has to do with anything?

Women being allowed to vote was done via constitutional amendment, again, by the legislative branch.

If you think marriage should be redefined and repurposed so it is not primarily about rearing one's own children, then, by all means, get it redefined, but, do it via legislation, not judicial activism.