The film is about a 16-year old girl in the UK (based on a memoir), growing up in the early 60s (61-62) and studying to apply to Oxford to read English (literature), who suddenly gets swept up (seduced) by a man twice her age (i.e., THE controversial subject matter). The unbelievable aspect of this text is that her parents get swept up as well, allowing her to attend concerts & night clubs & weekends at Oxford, and eventually to travel to Paris with someone clearly inappropriate for their daughter.
Jenny, the main character, just before she loses her virginity on her 17th birthday, says to David, the inappropriate con man: "If tomorrow night does happen, it will never happen again."
David (worried and confused): "Why won't it ever happen again?"
Jenny (clearly his intellectual superior): "Because the first time can only happen once."
Jump cut to: Paris hotel room. David smoking post-coital cigarette (yes, cliche) in bed while Jenny stands at window, also smoking (also cliche).
Jenny: "It's funny, though, isn't it... All that poetry and all those songs about something that lasts no time at all."
David (all he can muster to say is): "Yeah."
And isn't this what's wrong with Valentine's Day? Who can live up to all the hype in poetry, songs, and film...