Women during ages

What's the difference between women at ages of 8, 18 , 28, 38 and 48?

Age 8 - You take her to bed and tell her a story.

Age 18 - You tell her a story and take her to bed.

Age 28 - You don't need to tell her any story and take her to bed.

Age 38 - She tells you a story and takes you to bed.

Age 48 - You tell her a story to avoid going to bed.