As compared to 30 years ago. if you follow the graph on the article that I assume you are referring to that was on the front page a few weeks ago, the number of sexual partners in the 1900s was 2-3. Its predicted that number of sexual partners will be 8 for this generation compared to last generations 9. Not a big jump in my perview.
the socioeconomic situation and religion was way too different in the 1900s to compare. The shift in attitudes since the 90s on the other hand is remarkably large