Lisa,
I started to think my nipples were maybe more sensitive, and got interested.  I found on line that women with insensitive nipples use fenugreek oil.  I tried that for a while and now they are very sensitive.  They do stick out slightly more.  I just love it.  It makes me feel more feminine, and that makes my clothing seem more meaningful.  One just builds on the other in a fun way.
Enjoy the journey and leave a trail of crumbs for us to follow.
Lauren