The romance of Superman and Lois Lane is, indeed, an epic one. As is the tragic attraction that draws Batman and Catwoman towards the other. And even when their girlfriend knows from the beginning is real identity, as happened with Jay "Flash" Garrick with his lady Joan and Ralph "Elongated Man" Dibny with his lass Sue, there is an even more appealing coupling. That would be the crimefighting dating duo. And we have three prime examples today.
Katar Hol, Carter Hall and Jim Barr first discovered the miraculous anti-gravitational properties of heir anti-gravity metal belt, nth metal belt and gravity regulator helmet respectively. Katar and Jim were police men and used these devices to track down evil culprits that alluded traditional law enforcement authorities. Carter and Jim were a pair of scientists with a thirst for balance in the natural order around them. And Katar and Carter were two who thrived on communing with avian creation whose air they shared.
But there was something more these three men shared... the desire for companionship. And so, when Jim's girlfriend Susan Kent... also the daughter of his boss Sergeant Kent... desired to join him in his heroic crusade... he bequeathed her a duplicate helmet and similar costume. And thus, Bulletman and Bulletgirl were born, having several adventures throughout the 1940's before Doctor Sivana's Suspendium caught them and their fellow costumed crusaders of Earth-S in suspended animation until the 1970's. At that time, they joined the Squadron of Justice, although they were earlier members of the Crime Crusaders Club.
Carter and his fiancee Shiera Saunders repeatedly found themselves in adventures that called for his alter ego of Hawkman, and eventually temptation caused Hall to create another pair of wings and nth metal belt for his future bride. And thus, Hawkwoman was born, although she soon reverted to the identity of Hawkgirl. Although she never joined his team, the Justice Society of America, which she occasionally expressed interest in... she became an integral part of Earth-Two's All-Star Squadron. Together, these two Hawks also operated through the 1940's side-by-side on several cases. Eventually, she retired and never donned her costume again, and she took on a new role as mother to their son Hector.
Then there was Shayera Thal, who was a police woman on the planet Thanagar and also Katar's ally, both of whom tracked down a criminal to Earth-One. On this world, they adopted the names Hawkman and Hawkgirl, although she eventually changed hers to Hawkwoman. Around this time, she also finally gained the attention of her now husband's teammates on the Justice League of America, of which she soon joined. Although the pair had scores of adventures themselves, at times there were rifts between the two as political intrigue from their home world at times threatened their own lives. Nevertheless, the ultimately remained paired side-by side, as had the other two couples who were their counterparts.