Percent preference for male (closed circles; day 1 n = 10, day 3 n = 9) and female (open circles; day 1 n = 9, day 3 n = 8) rats shown separated by day of ethanol administration. A two-way ANOVA revealed no main effect of sex and no main effect of day, but there was a significant interaction between sex and day (F
(1,35) = 5.494, P < 0.05). *P < 0.05 relative to no preference at 50%.