Black Obsidian is a protective stone – it seals the energetic field and removes energetic hooks and attachments, making it useful for releasing past sexual- emotional ties. It is very useful for sexual shadow work – removing blockages in the 1st and 2nd chakras, clearing abuse-based reproductive problems or unwanted sexual beliefs/patterns that no longer serve us. Its clearing qualities make it particularly suitable for de-armouring.
You can read more about the de-armouring process on my yoni wands page.
The extra girth of the larger end of this wand also make it a great choice for self- or partner pleasure, with the smaller end being useful for focussing on specific areas inside the vagina.