In Poser 8, Pro, and I think Poser 7, the morph tool allows one to make a "bulge" at the appropriate place. I should think that this would take care of the "Kin doll" look. If I can do it, anyone can. But, if one cannot do this for oneself (old version of Poser, or using D/S), it should be a small matter to supply an injectable morph.

lmk

Probably edited for spelling, grammer, punctuation, or typos.