As I remember, most of the world population in the world had HSV-1.HSV-1 is very easy to trasmitted.Most of the people will get it in kindergarden/ taska because of cup sharing.HSV-1 easily be transmitted by saliva.Kissing parent to child, child to child at taska, child to parent and so on.......
Means dont blow/ lick too much.Stick to your healthy partner.