Ask her to come and look at the photo, and then tell her honestly how it makes you feel. Then man up and go take care of your duties. If you earn it, and keep her in the loop and as part of the equation she might just go find you a real one to show off.
Women are hunters too. Ever see a lioness bring a younger lioness to the male lion to satisfy his urges and uphold her place in the chain as head of the household.
Women love to see their man f*ck.
Men just need to learn to EARN the fun that their better half can and WILL bring to them if they desire to.
:)