Nothing to do with penis enlargement. Here is a tidbit from the above link:
"We've actually tried it and it does worked to provide faster ejaculate recovery times for much better second orgasms, an increase in ejaculate volume for longer, stronger "release sensation" and/ or an increased number of ejaculatory contractions for longer lasting orgasms. "
Google it, quite a bit comes up
I dont know too much about it myself.
Later