That is a feature of the old Taoist massages for long life. It is a Tantric way often practised by a few women on one man in ancient times as part of a ritual.

I use it in my novels (The Dream Team Series-www.brianandbyron.com) as a feature of the heroines performing it on their menfolk, for bringing protection and guidance to them when danger is upon them.

It is used in other meditations also. Orgasm does not always have to happen and learning to prolong that is essential for better performance for both sexes.