Of course, the P4 Nude Woman (a/k/a P4NW, Posette) has a number of preloaded morphs that are operated by the dials that appear on the right side of your screen when you select a body part. Check your P4 Help file (which is the P4 manual) for the details.

As for additional characters and morphs, you might start in the Free Stuff section here (link is at the top of the page). Select either Characters or Morph Targets, then select the last page and work your way backwards... you're more likely tofind P4NW morphs doing this. Traveler used to have a great set of free morphs for the P4NW at MorphWorld, but now I think you would have to buy them on CD there (morphworld30.com, if I recall). Of course, if you decide to stick with the P4NW for a while, instead of the Millenium Figures from DAZ, it would probably be worth the money.