All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.
It is not an obligation for a man or a woman to perform a ritual bath (Ghusl) after shaving the pubic hair. Shaving pubic hair does not necessitate a ritual bath. Please refer to Fatwa: 82245 about the things that require having a ritual bath and the different kinds of desirable ritual baths.
Allaah knows best.