One of the most common implements these days for spanking is the paddle. Similar to the brush the word paddle can cover a number of 'evils'. There are so many different types. One that most readily springs to mind is the Board of Education.
Probably quite often wielded by a woman like the one in the picture above.
There's also the Spencer Paddle, which has holes drilled in it to increase it's effectiveness.
Paddles, unlike hairbrushes, seem to be wielded by both sexes, although I think more men tend to use them than women, although I had no difficulty finding images of both men and women being paddled and by either men or women.
This selection from Hard Spanking Vixens gives us a good idea of a female paddling men scenarios.
The first two seem to be some sort of legal punitive action. Those are definitely hard paddling ladies and the two sets of buttocks have been wonderfully reddened.
Now this one is interesting. It's a small Spencer Paddle being used in the otk position, which is a little odd for that particular paddle. After she's done with Mrs Spencer, I think she'll go to work with the round leather model on the sofa next to her. That's going to be one very sore behind when she's finished.
I liked this very traditional scene from Spanking Films UK. The type of paddle used is different, though. It's a small round leather paddle, but it's two paddles connected. It wouldn't hurt anymore than a single, but the double slapping sound no doubt adds to the experience and may make the recipient think they're getting more than they really are.
This is from Spanking Sarah. It's a very rural scene, administered in a barn with a paddle that resembles a slat of wood. I wouldn't recommend using one of these, there's a good chance that it may splinter and do more damage than it really should.
I leave you with the flame haired Alison Miller from Firm Hand Spanking, bent over a pool table, having her backside paddled to the same colour as her fiery locks.