Did a fun demo with this last weekend.
The male part can really be used two ways. Point the rounded end towards the front, and cup under the testicles, and the little tapered part will give you stimulation in the area between the testicles and the anus. Point the rounded end to the back, and the little tapered part can give you more pinpoint vibrations at the base of the penis. The cobre works on the end of the penis, this works well for the base and the testicles.
This is a toy that is coupled very well with oral sex. But if you're not a fan of vibrations, you'll want to pass.