The female one is clearly to assert dominance over women, ideally in a painful and traumatical way. Also preventing them from getting pleasure from intercourse, because this is a men's thing.

For boys it is a barbaric ritual attached to some religions. The difference is that it is usually done on babies and is not particularly impacting later on.

Both are in my opionions felonies, done in the name of retarded ideas. The consequences are however very different.