We generally say as the time changes, most of things change, meaning of various things differ. While I agree to this statement, I also think that the underlying meaning to the things we have been doing since past – remain the same. It’s just the way of doing things that change, the perspective changes.
While the superficial meaning of marriage has changed, the underlying motive behind the marriage institution remains the same. In old times, marriage was to give security and have a partner in all levels of life. It was also to get a legal sex (illegal sexual activities were there in historical times too, just that they were very rare in numbers).
Today, as we are getting modernized, getting laid isn’t much of a fussy subject. We don’t need marriage to get laid (though extra-marital or pre-marital sex is still not a moral thing, though it has gotten legal now, of course a consensual sex). Today people get married to be financially secure (working couple is an example) or for various other things. But even then the underlying motive of marriage institution hasn’t changed. However modernized we get, we still need a partner in all aspects and levels of life.
2 + 2 will always be 4, no matter if we are in 1st century or 50th.
We mould things as per our requirement. Till 20th century asking for a bribe to do your work was a crime. And in 21st century, asking for a bribe and not doing your work is crime or let’s say immoral. (Because such crimes don’t get punished in India anymore, especially if the criminal is related to politics or politician)
But the immorality tag is still there attached with this activity. Asking for or paying a bribe was immoral till 20th century and is still immoral in 21st century. Though in 21st century we don’t consider it outrageous if our things are getting done.
In short, things don’t change really. Our perspectives do. Our methods do. But the underlying meaning, motive behind things don’t change. As we say truth never changes, though the perception about truths change for us.