Bar Refaeli has dated Leonardo DiCaprio, covered Sports Illustrated's Swimsuit Issue and topped a Maxim Hot 100 list ... but her real goal in life: To make a sex tape.

The stunning 27-year-old model is the star of Funny or Die's latest video, which is made to look like a Kickstarter campaign to get funding for her tape.

And there's even a fake Kickstarter page set up for the project!

"My name is Bar. I’m a model and actress, but I’ve never realized my true dream. I want to do it with some dude and film it and have people watch it. Please help," she writes on the page ... which also boasts some intriguing incentives to donate.

For $200: "A set visit. So you'd see me having sex in person. If you have time, obviously."

And for $1,000: "I'd put you in the running to be the lucky guy. Or girl."

The amount raised is currently over $159 million -- can you imagine how much this would raise in real life!