The sexual tension between Lena Luthor and Kara is incredible
And I say this as a staunchly homosexual male who is not usually titillated by such things. I don't know if its the actresses or whatnot, but whenever they have a scene together, I just want them to kiss already. They have more of a spark than Alex and Maggie or even Kara and Mon-El.
This seems to happen with every pairing of Superman family character and a Luthor on TV. I still recall the raucous celebration of the homoerotic tension between Clark and Lex on Smallville on the Television Without Pity boards (hoyay!).