Table 1. Values (mean ± SEM) for variables recorded on the tests for masculine behavior.

Variable	WT	ERβKO
Number of thrusts with intromissions per mounting episode	22.92 ± 8.25 (6)	29.76 ± 5.83 (12)
Total number of thrusts with intromissions preceding ejaculation	367.38 ± 59.05 (5)	326.80 ± 74.69 (8)
Total number of mounting episodes	29.92 ± 6.32 (9)	19.56 ± 7.60 (13)
Number of mounting episodes preceding ejaculation	28.50 ± 6.57 (5)	32.60 ± 8.31 (8)

The numbers of animals in each group is given in parentheses. No significant differences were registered between the groups.