AceShowbiz - Gwyneth Paltrow is shocked her kids get very frank lessons about sex at school.

The actress and wellness expert stars in and executive produces new Netflix series "Sex, Love & Goop", in which she and five couples discuss lovemaking techniques and tricks to reignite romance, and she confesses she was caught off guard a few years ago when her children, Apple and Moses, told her what they had been taught.

In a new clip touting Paltrow's upcoming appearance on Jada Pinkett Smith's Facebook Watch series "Red Table Talk", she says, "They, at their elementary school in sixth grade, had the craziest sex-ed talk, it was incredible... Full-on everything, like they learned everything. I will never forget Apple's face when she came home."

"(The teacher) told them everything. And when I say everything, I mean everything."

Gwyneth admits she was gutted she missed the boat in educating the two on the tricky subject.

"They hadn't asked me," she adds.

Meanwhile, in a podcast chat with Dax Shepard, the actress revealed she nearly died giving birth to daughter Apple.

"I had two caesareans. My daughter was an emergency. It was crazy - we almost died. It was, like, not good," she said.

"Anyway, there's a big scar across your body, and you're like, 'Oh, wow, that didn't use to be there (sic).' And it's not that it's bad, or you want to judge it, but you're just like, 'Oh, my god.' "