http://hp.adultfanfiction.net/main.php?cat=3For your interest and head-scratching pleasure: AFF.net's current HP categories and fic counts.
Barty Crouch Jr/Hermione [Fics: 6]
Betas [Fics: 87]
Bill/Charlie [Fics: 7]
Bill/Hermione [Fics: 2]
Blaise/Hermione [Fics: 12]
Challenge Fics [Fics: 136]
Challenges/Requests [Fics: 358]
Charlie/Hermione [Fics: 10]
Crossovers [Fics: 135]
Draco/Ginny [Fics: 78]
Draco/Hermione [Fics: 769]
Draco/Lucius [Fics: 39]
Draco/OFC [Fics: 31]
Draco/OMC [Fics: 10]
Draco/Ron [Fics: 5]
Female/Female [Fics: 149]
Fenrir Greyback/Hermione [Fics: 1]
Fred/George [Fics: 24]
General [Fics: 2174]
Harry/Draco [Fics: 2224]
Harry/Ginny [Fics: 65] Harry/Hermione [Fics: 146]
Harry/James [Fics: 9]
Harry/Lucius [Fics: 89]
Harry/OMC [Fics: 21]
Harry/Remus [Fics: 23]
Harry/Ron [Fics: 57]
Harry/Snape [Fics: 794]
Harry/Voldemort [Fics: 53]
Lists [Fics: 36]
Looking For Fics [Fics: 146]
Lucius/Hermione [Fics: 64]
Lucius/OFC [Fics: 14]
Male/Female [Fics: 1104]
Male/Male [Fics: 1333]
Marauders [Fics: 51]
Mary Sues [Fics: 15]
Mpreg [Fics: 63]
Parody [Fics: 71]
Percy/Penelope [Fics: 4]
Remus/Ginny [Fics: 5]
Remus/Hermione [Fics: 33] Remus/OFC [Fics: 9]
Remus/Sirius [Fics: 87]
Remus/Tonks [Fics: 14]
Rodolphus LeStrange/Hermione [Fics: 2]
Ron/Hermione [Fics: 7]
Ron/Lavendar [Fics: 1]
Sirius/Bellatrix [Fics: 1]
Sirius/Hermione [Fics: 8]
Sirius/OFC [Fics: 10]
Snape/Draco [Fics: 18]
Snape/Ginny [Fics: 8]
Snape/Hermione [Fics: 1069]
Snape/Lucius [Fics: 40]
Snape/OFC [Fics: 131]
Snape/OMC [Fics: 11]
Snape/Percy [Fics: 1]
Snape/Remus [Fics: 41]
Snape/Sirius [Fics: 21]
Threesomes/Moresomes [Fics: 396]
Virtual Hogwarts [Fics: 15]
Voldemort/Hermione [Fics: 9]