I know D&D 3.5 has a wide array of spells and items that can do pretty much anything imaginable. What i want to ask is are there any spells or magic items that will allow an undead to have a child without stopping being an undead permanently? I am willing to accept answer that involve the undead creature who wants to have a kid gouging out a part of his soul(In the form of experience gained by killing good adventurers) and creating a body for it through the creature created in this way should possess an intellegence score and have a free will. I am also happy to accept any answer that involves the undead temporarily becoming human in order to impregnate someone.
It doesn't matter if the child is living or undead as long as it has it's own free will.