a There were no effects of testosterone (T) on choice of the large, risky reward in sham males (n = 14). b There were no effects of T on choice of the large, risky reward in orchiectomized (ORX) males (n = 13). c Estradiol benzoate (EB) administration caused a significant reduction in lever presses to obtain the large, risky reward in sham males (n = 7). d EB administration caused a significant decrease in lever presses for the large, risky reward in ORX males (n = 7). e EB administration reduced win-stay behavior in sham males, but had no effect on lose-shift behavior. f EB administration reduced win-stay behavior in ORX males, but had no effect on lose-shift behavior. g, h There was no effect of EB administration on lever pressing in either sham (g; n = 7) or ORX (h; n = 7) males. Data are represented as the mean ± SEM percent choice of the large, risky reward (a–d), proportion of trials (e, f), or number of lever presses (g, h). An asterisk indicates statistical significance.