IF anyone knows what turns you on, it’s Annie Sprinkle.

In addition to being one of the biggest porn stars of the ’70s and ’80s, the buxom 50-year-old has also worked as a

dominatrix, stripper, porn director, Penthouse columnist, performance artist and renowned sex educator.

Now you can benefit from her experience with literally thousands of lovers in “Dr. Sprinkle’s Spectacular Sex: Make Over Your Love Life With One of the World’s Great Sex Experts.”

Yesterday, the good doctor sat down to answer a few questions for The Post:

You turned porn stardom into a feminist statement in the ’80s. What do you think of today’s Jenna Jamesons?

They’re better at business! [laughs] They’re making millions. That’s a different kind of political power.

How has porn itself changed over the years?

When I got into the business, in 1973, there were films that would have six sex scenes and a plot. We thought it was going to merge with Hollywood – but it went the other way. Now it’s wall-to-wall sex.

Do you think porn creates an unrealistic image of women?

Well, do Hollywood films create an unrealistic image? Do commercials? We get those messages from everywhere. There is porn that’s very misogynist – but porn is a mirror of our society.

How can couples use porn in a healthy way?

Porn has the potential to be educational. Couples can look at it and say, “Oooh, that’s disgusting.” Or, “I find that hot.” Sometimes the things that shock and disgust are a turn-on – that’s when it gets really complicated!

What’s the most common sex concern?

The No. 1 question I get asked by women is, “How do I have an orgasm? I can have one when I’m alone but not with my partner.” They simply need more education. In my book I describe many different kinds of orgasms. I believe my expanded concept of orgasm is the wave of the future.

What do you tell couples who aren’t getting it on the way they used to?

One big mistake is, people wait to have sex until the end of the day. Find the time of day when you have some energy. The best aphrodisiac is investing quality time.

In a youth-centric society, how can those over 30 still feel sexy?

People are much better lovers as we get older. Women in their early 20s, they don’t know s – – – yet! They have their charms, but very little experience. Before 25, you’re just learning the basics.

What was your goal for this book?

The goal is more spectacular sex for everyone! I wanted to take what I’ve learned and present it to the world in a

nonthreatening, compassionate and fun way. Even born-again Christians can enjoy it. A good, healthy sex life is a good