Should I Use An Inflatable Penis For Anal Stretching?

I have a new inflatable penis that a male playmate plans to use with me when he spanks my plump bare bottom, lubricates the inflatable penis with Elbow Grease Hot Cream, and uses it to stretch my anus open prior to topping me. Should I use the inflatable penis three times per week for anal stretching, or are there more effective methods and frequency of stretching to use to make my anus larger for a bigger penis during anal sex?