Figure 1. Mean Offering Rate (percentage of money offered) by the Male Participants to Less- and More-Attractive Female Partners.

Error bars represent the standard deviation for each condition. *** For the placebo group, the offering rate to highly attractive female partners is higher than that to partners with low attractiveness (P = 0.0004). ### The offering rate to highly attractive partners in the placebo group is higher than that in the minocycline group (P = 0.0004).