Padme, like every girl, knew it was practically impossible to find a man who was young, hot and good father material. She had to work with what she had: young, hot and psychopathic. Besides, her biological clock was ticking. She didn’t really care who provided the fiery seed, she just wanted a baby. Real bad.
She figured two out of three was good enough. The most important thing was Anakin was hot. And young.