The very best female genital for V4 is made by Karina Ionova at ShareCG for free and it is reported by a fan to be compatible with genesis by using the Genesis morph converter for sale here at renderosity. I don't see why we have to wait for Daz to create our own genital for Genesis by converting either M4 & V4 props or using a 3rd party genital.

http://www.sharecg.com/v/42779/3D-Model/A-new-genital-prop-for-V4,-A4,-G4,-S4,-L3-&-MGPT-f

http://www.renderosity.com/mod/bcs/index.php?ViewProduct=88362