Number of nodes (mean and standard deviation in %) lying in the specific regions of the <i>Z-P</i> parameter space separately for women and men under the three kissing conditions.

R1 = ultra-peripheral nodes, R2 = non-hub peripheral nodes, R3 = non-hub connector nodes, R4 = hub peripheral nodes, R5 = hub connector nodes, RK = romantic kissing, K-SA = kissing while performing silent arithmetic, and HK = hand kissing. Note that there were no kinless nodes (R6) at all. Number of nodes (mean and standard deviation in %) lying in the specific regions of the Z-P parameter space separately for women and men under the three kissing conditions.