Because it shows a successful black woman that ends up with a white guy. Oh and she cusses like a sailor.

Uh, even today, repeated use of the F-word will get you an R-rated. You can only say the F-word twice in a PG-13 movie; more than that will get you an automatic R. Even then F-words in PG-13 movies can't be used in a sexual context, just as an epithet. Recently, 2011's
My Week with Marilyn
was rated R for several F-words. Other than that, the movies is completely harmless.
Also, everyday people used the F-word freely in the 1980s. We weren't as prudish as you may think. In fact, we as a society have gotten more conservative post-9/11. The teen comedies of the '80s had a lot of gratuitous sex and nudity. Even into the 1990s, you had coming-of-age stories like
Now and Then
, where teen/preteen boys are shown naked from the back and covering their genitals with their hands. That wouldn't fly today. Also, A League of Their Own had a lot of sh!ts and innuendos, and still got a PG rating!
Adventures in Babysitting
would be so toned down. That had two F-bombs (plus a few sh!ts and a$$holes), not to mention suggestive language, and that was rated PG-13. Disney recently remade it, and instead of "Don't beep with the babysitter!" they changed it to "Don't
mess
with the babysitter!" Yeah.
.
.

People don't seem to realize that 1986 was a different time that 2010. The F word was looked at as very taboo then as opposed to now where people can't say a sentence without using it 5 or 6 times.
The past doesn't exist and the future is only an illusion.

The "F" word isn't exactly rated G you know, that and violence!
"All my friends are dead
All my friends are dead"
Turbonegro

just using the f word in any context in relation to sex will get you an R rating nowhence why in live free or die hardthe pg-13 version has the gunshot on the f word.

The rating standards have decreased over time.

I think if the exact movie was released now it would still be R for the language.

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The Constant Use of the "F" word perhaps and references to sex (i.e. when she is being followed down the street by those guys who pester her)