Bill Clinton, Sex Therapist Spotted Side-By-Side At Serena Williams US Open Match

Former President Bill Clinton appeared to have had an interesting conversation with sex therapist Dr. Ruth Westheimer, whom he was sitting next to during Serena Williams' U.S. Open match against Danka Kovinic in New York City Monday.

In a clip from the live broadcast shared by Raw Story reporter Sarah Burris via Twitter, the 76-year-old politician and Westheimer, 94, were immersed in a private conversation and were seen smiling and nodding at one another during the game.

At one point, the sex therapist appeared to give Clinton a playful slap on the face, and the former president's face turned red during their discussion.

The post garnered humorous comments from social media users, some of whom joked that Westheimer could be giving Clinton advice.

"Dr. Ruth still out here??? And Bill a wild boy for this even by his standards," one Twitter user wrote.

Another commented, "This is amazing. Slick Willy is truly one of a kind."

ESPN analysts John McEnroe and Chris Evert also noticed the pair chatting during Monday's match.

"Who knows what they're talking about?" McEnroe said on the broadcast.

"They're really involved in some sort of..." Evert responded, before suggesting, "She's giving him advice. Yep, 'you shouldn't be doing that.'"

"Why is his face getting redder?" McEnroe joked before the clip ended.

Other famous personalities who were spotted at the sold-out opening day of the U.S. Open at the Arthur Ashe Stadium in Flushing, New York, were "X-Men" star Hugh Jackman, actress Rebel Wilson, boxer Mike Tyson, fashion designer Vera Wang, Olympian Lindsey Vonn, Anna Wintour, Emmy-winning actress Sela Ward and tennis legend Martina Navratilova, according to the New York Post.

Williams kicked off her farewell tour Monday night by beating Montenegro's Kovinic, 6-3, 6-3.

Earlier this month, the 23-time Grand Slam singles champion announced her upcoming retirement from tennis. She admitted in an article for Vogue that she was "evolving away from tennis."

"I've been reluctant to admit that I have to move on from playing tennis. It's like a taboo topic. It comes up, and I start to cry. I think the only person I've really gone there with is my therapist," Williams wrote.

"I have never liked the word retirement. It doesn't feel like a modern word to me. I've been thinking of this as a transition, but I want to be sensitive about how I use that word, which means something very specific and important to a community of people," she wrote, adding that the best word to describe her retirement was "evolution."

However, with her victory over Kovinic, Williams put off the end of her career for at least another match as she advanced to the second round of the U.S. Open.

Williams has yet to officially confirm the date of her retirement.