Fairy was originally an egg-group of Pokemon, it doesn't exactly carry any gender intrinsically.
Cute Pokemon or animals can be of either gender anyway.
Not all fairies are cute little fluttery pixies. Pokemon should reflect this with some more mature and powerful designs. Xerneas is a good start, but there's absolutely so much more they could do with it. If not this generation, they had better for the next. It would be a huge waste of potential otherwise.