Is US-style dating part of their culture? In the 80's and 90's I dated a few women from countries in Europe and they all thought the 1-on-1 date thing was weird

Is US-style dating part of their culture? In the 80's and 90's I dated a few women from countries in Europe and they all thought the 1-on-1 date thing was weird, telling me that people usually go out in groups, and then pair off over time. I won't go into detail, but the relative intimacy of various sex acts was also out of order from what the US expects based on what they told me. Today, I have three friends with sons in their late 20's, and NONE of the boys have ever had what my generation would call a "steady" girlfriend, e.g., >6 months. I find that bizarre, but I'm old. Culture changes.