Ryan even joked on the show's premiere that he has to avoid some towns in order to not bump into his former flings.
During the August 18 episode of Married at First Sight: Unfiltered, host Jamie Otis asked Brett, "What do you think of the fact that he admits to dating all of Houston prior to marrying you?"
Jamie -- who starred on Season 1 of Married at First Sight and is still married to her match, Doug Hehner -- laughed and added in all seriousness, "Does that bother you at all?"
Brett smiled and replied, "It's red flag-ish."
"But it's not something that -- especially for a guy -- that I would put a lot of thought into," Brett continued. "Like, they want to go out and have a good time, and we're young."
Bao noted, "That's a good point," considering her husband Johnny had admitted to being on over 100 first dates before marrying a stranger.
"To me, that's just the culture of being single. And I'm like, 'Well, you're with me now, so it doesn't [really matter].' The 'before' doesn't matter that much," explained Brett, who hadn't been intimate or even kissed a man in two years before the show.
Prior to Brett revealing her perspective on dating, Bao admitted she initially viewed Johnny's extensive and shocking dating history as a "a big red flag."
"It was shocking. It was very surprising -- not too surprising because I know him," Bao shared.
FOLLOW REALITY TV WORLD ON THE ALL-NEW GOOGLE NEWS!
Reality TV World is now available on the all-new Google News app and website. Click here to visit our Google News page, and then click FOLLOW to add us as a news source!
"I mean, Johnny had a reputation... He was the popular guy, and my female friends who knew him always told me, 'He has a lot of women interested in him.'"
When Jamie asked Rachel how she'd feel if her husband, Jose, had dated so many women before tying the knot, Brett playfully called Rachel out "for dating all of Houston" as well.
"I guess I'm a serial dater," Rachel confirmed with a laugh.
"[But] I'm way, way less than 100 [first dates]. But I mean, I like first dates. I feel sometimes the more you date, the more you're ready because now you know more of what you want and what you don't want."
Rachel said Jose was unaware of her dating history except for her former relationships, long and short. Rachel said Jose also learned she had been cheated on but knew very little about her brief romances in between the significant or serious ones.
However, Ryan viewed Brett as being uniquely attractive on their wedding day, and he called his wife "beautiful" with "amazing eyes."
Brett, in turn, admitted she's not usually drawn to men like Ryan either when taking into account his country-boy roots. However, she noted his character traits were "on point" and she liked his beard.
Brett determined that Ryan may be a good balance for her because she's a realist and he's very positive and cheery.
Brett hoped Ryan would be able to bring out the best in her, but she questioned whether she would fit into the life Ryan was used to.
The couple continued to bond on their honeymoon in the Florida Keys and open up to each other like never before. They discussed sex and having children in the near future, and Brett gushed about how Ryan was making it easy for her to let her walls down.
Ryan told his wife, "I know it's a difficult subject, but I am a pretty sexual person."
But Brett shared in a confessional, "I want to make sure the feelings are there before anything physical happens."
Brett admitted that she was falling in "like" with her husband, and he seemed equally as pleased about his match.
"I feel like it hasn't been that long but I want to be around you," Brett told Ryan.
Married at First Sight's thirteenth season, which currently airs on Wednesday nights at 8PM ET/PT on Lifetime, also stars Gil Cuero and Myrla Feria as well as Michaela and Zack.