If there hadn’t been women we’d still be squatting in a cave eating raw meat, because we made civilization in order to impress our girlfriends.
Orson Welles (1915–1985) American writer, director, actor
Interview with David Frost, David Frost Show (12 May 1970)
(Source)


FYI, a transcript of the David Frost interview containing this quote is here: http://bit.ly/2sOi0U1.
Thanks. Citation updated.