On the one hand, I think that women should feel comfortable with whatever they were born with. I think that it's unhealthy to push women to think that the "porn star" vagina is ideal because it makes that level of comfort more difficult. There are some women treat cosmetic surgery to their vagina as a "gift" to their husbands, which really grinds my gears because they somehow feel that it's okay to mutilate themselves to serve a man's ideal.
On the other hand there's a surgery for "tightening" the vagina, which I can appreciate as a mother (even though I don't feel that much of a difference after giving birth, maybe I would after several babies). I like the idea that women can "rejuvenate" the structure and elasticity of themselves after such a potentially body-wrecking process such as pregnancy and vaginal birth.
I suppose that these arguments hold true for any cosmetic surgery, but there's something about doing it to one's vagina that makes it more troublesome.