Do you have a source for that? I have somewhat suspected that was the case based on some other things I've heard, but I have been unable to find any real sources on it.
https://www.washingtonpost.com/news/speaking-of-science/wp/2...
"But as people gained awareness of the contagious nature of cold sores, they became more cautious about exposing young children to a skin outbreak. That means more and more of us get to adulthood without any HSV immunity.
On the one hand, that makes the younger generation more susceptible to HSV-2 -- one won't 100 percent protect you from contracting the other, but they have some antibodies in common. On the other hand, it means that more and more people get their first exposure to HSV-1 not through kissing, but through oral sex."