MILF pornography

[1] Central to the typical MILF narrative is an age-play dynamic of older women and younger lovers of any gender.

[2] A related term is cougar, which implies an older woman is acting as a predator.

[4] The earliest known online reference is a 1995 Usenet post about a Playboy pictorial of attractive mothers.

[3] It was popularized by the 1999 film American Pie referring to Jennifer Coolidge's character, "Stifler's mom".

Oxford Dictionaries defines a yummy mummy as "an attractive and stylish young mother".