Trying to find miss and mister of the last month with highest rating

Hello,

at my website users can rate each other:

# select id, nice, last_rated from pref_rep where nice=true
  order by last_rated desc limit 7;
           id           | nice |         last_rated
------------------------+------+----------------------------
 OK152565298368         | t    | 2011-07-07 14:26:38.325716
 OK452217781481         | t    | 2011-07-07 14:26:10.831353
 OK524802920494         | t    | 2011-07-07 14:25:28.961652
 OK348972427664         | t    | 2011-07-07 14:25:17.214928
 DE11873                | t    | 2011-07-07 14:25:05.303104
 OK335285460379         | t    | 2011-07-07 14:24:39.062652
 OK353639875983         | t    | 2011-07-07 14:23:33.811986

And I know their gender:

# select id, female from pref_users limit 7;
       id       | female
----------------+--------
 OK351636836012 | f
 OK366097485338 | f
 OK251293359874 | t
 OK7848446207   | f
 OK335478250992 | t
 OK355400714550 | f
 OK146955222542 | t

I'm trying to construct 2 queries -
one to find the female user with
highest count of ratings for the last month
(not just for the last 30 days -
and this condition is already killing me)
and the same for non-female users.

Any help please? SQL is so hard sometimes.

Regards
Alex,

using PostgreSQL 8.4.8 / CentOS 5.6