Frame is 5 ft 8 in. at 153 lbs. 560 cc's is the size that will look natural on me? Porn star look? or just right?

Hello and thank you for your question.  The size, profile, and shape of the
implant is based on your desired breast size/shape, your chest wall
measurements, and soft tissue quality.  This decision should
be based on a detailed discussion with equal input from both you
and your surgeon.  This entire surgery
can be performed with a small incision technique.  Make sure you
specifically look at before and after pictures of real patients who have
had this surgery performed by your surgeon and evaluate their results.   The most important aspect is to find a
surgeon you are comfortable with. I recommend that you seek consultation with a
qualified board-certified plastic surgeon who can evaluate you in person.
Best wishes and good luck.
Richard G. Reish, M.D.
Harvard-trained plastic surgeon

Thank you for sharing your question.  Unfortunately without a full series of photographs it is difficult to offer definite advice as your results would depend on the profile implant and width of your chest.  I would see an ASPS board certified plastic surgeon in consultation who can listen to your goal results and offer the best implant recommendation.  Best wishes.