Avoid using oil as a lubricant you constantly require a water based lubricant the oil throws from the ph balance of a woman’s human body.Oil for the rectum is ok oil when it comes to vagina is certainly not. It’s also far better maybe not work with a desensitization gel from the anal area either because with continued make use of your anus will loose feeling rendering it harder to go number 2 or even even worse you might easily go too with out control of doing this.