It seems to me that the present and future subjunctive is the exact same.
For example, to say
Bette is hitting on Tex so that he will give her good grades. (future)
you would say
Bette drague Tex pour qu'il lui donne de bonnes notes.
If you want to say
Bette is hitting on Tex so that he gives her good grades. (present)
you would STILL say
Bette drague Tex pour qu'il lui donne de bonnes notes.
Why is that? Is there no separate future tense for the subjunctive?