I don't know if CGT would allow it, but if they do then for certain it would need to be marked as Mature content and you would need to await a review and approval from the Support team. You can upload the product just like any other product, but you must mark it as mature, and then wait to see if it gets approved. There is nothing "illegal" about BDSM type products at all, but certain things may be considered "obscene" or distasteful enough for CGT to reject the product.