If you use a strap on with another woman, are you getting as much out of it as she is? You can't feel anything. Is it a feeling of power or dominance by fucking her? Is it more just to do for her pleasure? If you are a lesbian, why use an authentic cock? If you could, would you want to cum inside a pussy? Why not just use a regular dildo or vibrator?
Last, if you have fucked a woman with a strap on, isnt doggy and awesome visual?
