I don't why people are discussing about the sexuality of the characters, GF is behind everything, is pointless.
If you choose male or female it doesn't matter, you do the exact same thing, you express in the exact same way, your relationship with everyone is exactly the same, you're the same character regardless of your gender.
And Lillie likes more the male character than the female? Yes, why? GameFreak, not Lillie, GameFreak, they make it in that way to avoid controversy, they write it in that way, in the moment that they did it Lillie just stopped being a character to me. Is just stupid to discuss about this.
