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.