Bradley Cooper is interested in keeping things purely platonic with frequent co-star Jennifer Lawrence.The 40-year-old actor appeared on Howard Stern's Sirius XM radio show on Wednesday, where he set the record straight on why he and the 25-year-old actress, who have appeared on the big screen together multiple times, have never dated."It just didn’t happen," said Cooper, clarifying that he and Lawrence would "never" sleep together.They don’t have, however, the real-life romance aspect.

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“It’s not the way we are together."WATCH: Bradley Cooper Stands by Jennifer Lawrence Over Equal Pay in Hollywood: 'There Is a Double Standard'Cooper also admitted that his past reasoning -- that Lawrence was too young for him -- wasn't entirely true."I said that once on a red carpet just as a diffuse thing," said Cooper.

"And then it became a thing because the girl I was seeing [23-year-old Suki Waterhouse] was as young as she was."Listen to the interview, below.

Bradley Cooper and Jennifer Lawrence are—and this is likely going to be seen as semi-blasphemous by some—probably the closest thing we have in this Generation Snapchat to a Bogey and Bacall.

They are about to appear in their fourth movie together, ), and they have the Bogart-Bacall age difference (though theirs isn’t quite as extreme).

We just started where we left off, and that’s rare.

It’s just easy to look at her and feel like I’m telling the truth,” he said of the 25-year-old actress with whom he co-starred in Cooper, playing a supporting role in the film that Lawrence dominates, loves the fact that there is absolutely no love interest between Neil and Joy in this movie, not even hinted at. You know, there was a guy who gave Joy a chance and she was the first at doing a spokesperson at QVC. Cooper’s Neil Walker seems to want her to succeed even more than himself which is an unusual trait in the way movies normally portray TV executives.

This, of course, leads to occasional teasing from Howard Stern, who asked the actor about his frequent co-star on his Sirius XM satellite radio show on Wednesday."When are you two gonna have sex? "Everyone is waiting for that.""Never," Cooper replied. But no, not even close."Cooper's ex-girlfriend, Suki Waterhouse, is 23—two years younger than Lawrence.

"It's just not the way we are together."The 40-year-old actor and 25-year-old actress played love interests in the films if he and Lawrence were dating."Oh my God. "No, my God, no.""No, no, no, no, no, not even close," he continued. He is currently dating Victoria's Secret model Irina Shayk, 29."We've done two movies together," he added.

His mother ordered things all the time – and still does. That was a whole thing and when that hit, when Comcast owned it, it was a big thing for the Tri-state area and I would come home every day from school and there’d be QVC boxes by the door.