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1.
In general the word milf literally means: mother I'd like to fuck. But in porno a milf is simply a woman who is obviously too old that no amount of makeup could pass her off as 18. Whether she is actually a mother or not is completely irrelevant. As long as she looks old enough to be a mother and fucks on film for a living, she can say she is a milf.
Aging Pornstar: I'm getting too old to keep doing porn. Maybe I should think about a career change.

Manager: Nonsense! Milf porn is a growing industry!

Pornstar: But I'm not a mother.

Manager: Who cares? You can just be a porno milf! After all, porn is supposed to be fantasy.
by theguythatsaysstuff April 03, 2009