Maybe yes maybe no. It depends on the type of brothers she encounters. Jennifer might not be ready for the 50 Cent type, but I wouldn't be shocked if I saw her with a Craig Melvin type. In my years of observing IR couples, I've learned that there is a type out there for everyone.
If i'm not wrong 50 Cent used to date Chelsea Handler in the past and Chelsea used to be very close with Jennifer, i don't know if they are still friends but i'm assuming that 50 Cent wasn't a total stranger to Jen if he dated her friend.
Josh Levi and Billie Eilish during Turning Red premiere from Disney The movie have a fictional boyband 4 Town and Billie and her brother wrote the songs while Josh is one of the voice actor/singer from the boyband. I don't know if they knew each other before but she is hugging like they are old friends.
This is from few years ago, just Alicia Keys joking about her son having a crush for Taylor Swift. He is a cute boy.
Not a couple, but you can see they have physical chemistry. Three different photos and dude is hugged close on Mandy and she seems VERY pleased.
They just have one of those close m/f friendships. https://hotlifestyletale.com/entertainment/sterling-k-brown-mandy-moore-are-basically-related-irl/ https://people.com/parents/mandy-moore-introduces-son-gus-sterling-k-brown-this-is-us-set/
In the pilot episode of "1883", there was that one on one scene her character Elsa had with that young black cowboy . . . it was foreshadowing for how open-minded and revolutionary Elsa would prove to be on that "Yellowstone" prequel
Pretty cool story told by Jane on these photos and her time with Geoffrey https://ew.com/movies/jane-seymour-live-let-die-photo-untold-story/