In some books, like the Bible, it's the meaning that's important and its necessary to have new translations and updates to get the message across.
However, in a lot of literature it's the words and language that are important. There is a benefit in reading books whose language challenges you a little.
And 'intercourse' has the same meaning it always has. 'Sexual intercourse' is just a subset of the larger meaning. Just ask the residents of Intercourse, Pennsylvania or Intercourse, Alabama.
