Lightning was intended to be very masculine. I am glad that she is like she is. I don't have a masculine impression of her at all. She is very female and a bit androgynous, androgynous like Cloud (who is like her pretty androgynous but still totally masculine unlike her) also is but still her whole appearance is very feminine ("tomboyish" still is not too inappropriate when it comes to her behaviour). That was not made without reason. He said, he wanted to make her more masculine but then he changed it for obvious reaso, I mean they even needed a lot effort to program her legs and walking. So when comparing her and Cloud, for example you can find many similiarities but you definitely notice that the one is a man and the other a women. And no, I don't talk about breasts. Ah, ha, ha, ha.
To topic: Lightning should have a love interest. But when the story is about to end or afterwards.