Source of data on Scott's statistics

In the latest "mailbag" pod Scott talked about finding "facts" that he then incorporates into various presentations. The one he cited today that 50% of men 18-24 years old had never asked a woman on a date in person. Where is this data from? What men, US only? White? I can find people talking about the study - and the nuance is different from the top line, women also are facing challenges. He does this often, states things as facts with out backup.