On a Saturday night in July, Lexa took a swig of spicy margarita, peeled off her daisy dukes and sheer top and jumped naked into her boyfriend’s hot tub.

“Look at her tits — aren’t they great?” her boyfriend, Raul, asked their two male guests. “Do you want to touch them?”

The two men walked over and started kissing Lexa’s body before moving to the bed inside. But Raul didn’t join them.

“I just watched these two very attractive men have sex with my girlfriend,” he told The Post. “And I loved it.”

The fetish — known as cuckolding — is a common kink where a man takes pleasure in watching his partner sleep with other men. The practice recently made headlines when it was reported that evangelical leader Jerry Falwell Jr. allegedly enjoyed watching his wife, Becki Falwell, have sex with their 20-year-old pool boy, Giancarlo Granda.

The Falwells admitted that Becki did have an affair with Granda, now 29, but denied claims that Jerry ever watched the pair get hot and heavy and instead say the pool boy is attempting to extort them. The now-former head of conservative Liberty University has since resigned from his prominent position, but speculation about his supposed sexual proclivities continues to swirl.

Raul, 35, and Lexa, 26 — whose names have been changed for professional reasons — say couples shouldn’t be ashamed of the kink if they’re into it. In fact, the fetish — which they’ve acted on “dozens” of times — has brought the Brooklyn couple closer, they said.

“Since she knows that I’m going to help her get laid … it just makes our emotional bond stronger,” said Raul, who works in marketing. “If I can help my partner achieve that — that’s my way of showing my love for her.”