The First Time (1968) [American]

a.k.a.: You Don't Need Pajamas at Rosie's

Pretty awful movie about three teenage boys who help Jacqueline (as "Anna") cross the border from Canada into the US. They think they've "picked her up". The dialog is particularly unbelievable.

"You Don't Need Pajamas at Rosie's" was a working title; I believe it was shown in the UK under that title (or "They Don't Wear Pyjamas at Rosie's").

"The First Time" is (or was) available on video. It has also shown on cable TV. Some references list the date as 1969, as does the video packaging. But film itself lists a copyright date of 1968.