Table 1. Summary of experimental parameters and results from Experiments 1 and 2.

Statistical Test: Generalized Estimating Equation (GEE) using a normal probability function, identity link, and independent working correlation matrix

Variable	Experiment 1: Viewing Male Scrota N = 56; 29 female, 27 male	Experiment 2: Viewing Female Hindquarters N = 55, 28 female, 27 male
(1) Sex: 2 sexes recoded into 1 dummy variable, Exp 1 reference variable = male, Exp 2 reference variable = female
Sex	B = −5.898, X2 = 0.238, p = 0.626	B = 2.764, X2 = 0.035, p = 0.852
(2) Condition: 4 stimuli recoded into 3 dummy variables, seashell blue = reference variable; Exp 1 Macaque = scrotum; Exp 2 Macaque = hindquarters
Macaque Red	B = −1.672, X2 = 0.026, p = 0.871	B = 10.628, X2 = 0.469, p = 0.493
Macaque Blue	B = −5.410, X2 = 0.357, p = 0.550	B = −2.567, X2 = 0.048, p = 0.827
Seashell Red	B = 2.998, X2 = 0.073, p = 0.787	B = 9.586, X2 = 0.707, p = 0.401
(3) Interaction Terms: Exp 1 Sex = female, Macaque = scrotum; Exp 2 Sex = male, Macaque = hindquarters
[Sex]*[Macaque Red]	B = 34.454, X2 = 3.860, p = 0.049	B = −11.036, X2 = 0.381, p = 0.537
[Sex]*[Macaque Blue]	B = 19.537, X2 = 1.910, p = 0.167	B = 33.874, X2 = 3.125, p = 0.077
[Sex]*[Seashell Red]	B = 2.904, X2 = 0.037, p = 0.846	B = −4.168, X2 = 0.065, p = 0.799