Hannah made the disclosure on The Bachelorette's finale, which aired in late July on ABC.
"To be completely honest, I've always been someone that's been more private about that," Peter said of what happens in the bedroom (or the windmill, in the case with Hannah).
"I understand that it came out... And I know people have had fun with it and I guess it's a good thing that I've kind of been laid-back and easygoing about it," Peter told People.
The windmill has been an ongoing joke and was even featured on the first promo for Peter's upcomingThe Bachelor season, which wrapped filming in November and premieres with a three-hour event Monday, January 6 at 8PM ET/PT on ABC.
"But honestly, my private life is my private life, and I don't necessary like that it defines me. I don't want that to define me," Peter said.
"There's so much more to me than just a windmill. And I'm ready for that to be left in the past."
Although Peter and Hannah had some serious chemistry on her season, Peter admitted he's only looking forward when it comes to his love life.
"Out of respect for hopefully my future wife that I want to find, we just need to move on," Peter told the magazine.
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However, ABC released a The Bachelor promo last month showing that Hannah made a surprise visit to see Peter -- who finished in third place on her The Bachelorette edition -- while he was filming the show's 24th season.
The Bachelor host Chris Harrison recently told Entertainment Tonight that Hannah's appearance on Peter's season was "a thing" and "not just a, 'Hey I'm here to hit you on the shoulder and say good luck.'"
"It's more than that," Chris recently insisted of the pair's televised reunion.
The Bachelor promo that had fans talking featured Hannah and Peter flirting and getting touchy-feely while sitting side-by-side on a sofa in a quiet room.
"What are you doing here?" Peter asks Hannah in the clip, which aired on Dancing with the Stars' Season 28 finale after Hannah took the stage with her professional partner Alan Bersten.
"I'm making decisions for my heart, because I know there's still something there," Hannah replies. "And I would do anything for a relationship."
The pair's body language suggested there was potential for reconciliation, especially given Peter leaned in close to Hannah and nearly tried to kiss her.
Peter then apparently proceeded to invite Hannah to become one of his Season 24 bachelorettes.
"Hannah Brown, what I'm about to say is extremely crazy. What would you say if I asked you to come and be part of the house?" Peter asks Hannah as he rubs her back and she giggles.
Women were shown eavesdropping in on the conversation from a distance and yelling, "Oh my God!"
And in a second promo for the new The Bachelor season that aired later during the Dancing with the Stars broadcast -- which concluded with Hannah being crowned champion over three other finalists -- Hannah stepped out of a limo at the show's Malibu mansion.
According to Reality Steve spoiler blogger Steve Carbone, however, The Bachelor viewers shouldn't read into the promos too much.
"B4 everyone freaks out... Hannah WAS NOT a contestant on Peters season," Carbone tweeted late last month.
"She gets out of the limo to talk to him night 1 (didn't join the party), & shows up on a date in ep 3 again to talk," he continued. "Both were in LA. She just took a couple hrs off DWTS to do it."
To learn more about the 30 bachelorettes who will be competing for Peter's heart, click here.
For spoilers on Peter's journey to find his match and his Final 3 bachelorettes, click here. To read about unprecedented drama during a hometown date, click here.
Also click here for more spoilers that reveal how Peter's season will not have "a normal ending."