 If you liked
Vandread
|
 ...then you might like
Aquarion Evol
|
Men and Women are separated initially. They fight in mechs that combine in an orgasmic way. In vandread the enemy is harvesting human beings for their body parts whereas in aquarion they're harvesting humans for their life energy.
The theme of mecha, sci-fi, themes and women are involved in part of both series.
There is mystery surrounding the background of both series as drama develops between characters. Additionally, the main protagonist has a destiny and mysterious connection.
Speaking of which, there is also romance in both series involving the main protagonist.