Symmetry preference strength as measured by Pearson correlation coefficients between attractiveness and each of face and body symmetry rated by women at low- (dark bars) and high- (light bars) fertility points of the menstrual cycle (n = 117, all <i>p</i> values<0.001).

<p>95% CIs are shown.</p

Contour plot showing the correlations between voice pitch, rated masculinity and attractiveness (colour "heat" corresponds to increasing voice pitch, which ranged from 85.3–134.2 Hz, blue being low pitch and red being high pitch).

<p>Contour plot showing the correlations between voice pitch, rated masculinity and attractiveness (colour "heat" corresponds to increasing voice pitch, which ranged from 85.3–134.2 Hz, blue being low pitch and red being high pitch).</p

Means (±SE) of the sperm parameters, and the principal components analysis of their variation.

<p>VAP, average path velocity; VSL, straight line velocity; VCL, curvilinear velocity; ALH, lateral amplitude of sperm head; BCF, cross beat frequency; STR, straightness; LIN, linearity.</p

Scatterplot showing the association between voice attractiveness and sperm concentration (controlling for time since last ejaculation and frequency of sexual activity; red line shows the best least squares fit to the data).

<p>Scatterplot showing the association between voice attractiveness and sperm concentration (controlling for time since last ejaculation and frequency of sexual activity; red line shows the best least squares fit to the data).</p

Masculinity preference strength as measured by Pearson correlation coefficients between attractiveness and each of face and body masculinity rated by women at low- (dark bars) and high- (light bars) fertility points of the menstrual cycle (n = 117, all <i>p</i> values<0.001).

<p>95% CIs are shown.</p

Scatterplots for high- and low-fertility ratings of attractiveness versus masculinity (top row) and symmetry (bottom row) for faces (left) and bodies (right).

<p>Lines of best fit are shown for both low- and high-fertility ratings. They overlap in each case so that only one line can be seen. × = low-fertility ratings. xˆ = high-fertility ratings.</p

Mean (±S.D) female ratings of male faces and bodies for all appearance variables.

<p>Mean (±S.D) female ratings of male faces and bodies for all appearance variables.</p