Fig. 4

Average mating angles and tilting indices at 10–15 min into copulation. Extreme mating angles and tilting indices occur more often in ‘left lobe cut’ males (green squares) and ‘left lobe shaved’ males (red triangles) than in untreated control males (blue circles) at 10–15 min into copulation. Mating angle correlates with tilting index in ‘left lobe cut’ males, while this is not the case in ‘left lobe shaved’ males