heterose
analogy that comes to mind, with fond memories of someone once intimate in the heterosexual sense
moonbeam nor daylight, deter yet delight in the beauty of "heterose".
Heterosity
Curiosity about dating for mating, flows in two directions, always results in at least triplets when done correctly.
Elon Musk's heterosity has resulted in triplets, twins, ten overall children and plans to make humanity and interstellar species.