South Park The Fractured But Whole has 40 Yaoi Art Piece Locations. Find all Yaoi Pictures for Boy Love Aficionado Trophy / Achievement and to complete the Scavenger Hunt "The Yaoi Project".

You can find a map for all 40 Yaoi Locations in the basement of Bebe's house. This will show you how many Yaoi Collectibles there are per building.
Luckily, nothing is missable! You can still get everything after the story. It is highly recommended that you wait with this until having beaten the game because a lot of Collectibles require buddy skills that are only unlocked through story progress. Much of the map is completely inaccessible until the endgame.

The Yaoi are drawings of Craig and Tweek (a reference to the TV series when the Japanese girls were drawing pictures of them). They are colorful artwork hanging inside buildings and garages around South Park. Almost every building has one of them. At most there are two per building. The game auto-saves your progress when entering/leaving a building so you needn't worry about manual saves.

After all 40 Yaoi Art Pieces have been found, bring them to Craig's Dad to finish the Scavenger Hunt: The Yaoi Project. Collecting this stuff also gives a bit of XP.

In this guide I go through them road by road from left to right (bottom road, middle road, top road).

TIMELINE (with location name):

Bottom Road (Left to Right)
#1 - South Park Elementary - 0:05
#2 - South Park Elementary - 1:00
#3 - Community Center - 1:32
#4 - Bebe's House - 2:07
#5 - Kevin Stoley's House - 2:32
#6 - Clyde's House (Garage, Key in Raisins Bag) - 3:46
#7 - Henrietta's House - 4:22
#8 - Jimmy's House (Garage) - 4:51
#9 - Butters' House (Garage) - 5:37
#10 - Cartman's House (Garage) - 5:57
#11 - Stan's House - 6:40
#12 - Kyle's House - 7:06
#13 - Kyle's House (Attic) - 7:27
#14 - Kenny's House - 7:47
#15 - Kenny's House (Garage, Key in Parent's Bedroom) - 8:12
#16 - Sodosopa - 9:01

Middle Road (Left to Right)
#17 - Stark's Pond North - 9:15
#18 - Church (Keycode in Bible Right Room) - 9:32
#19 - Park County Police Station - 10:15
#20 - City Hall - 10:40
#21 - City Hall - 10:52
#22 - The South Park Gazetta - 11:12
#23 - Main Street Offices - 11:32
#24 - Tom's Rhinoplasty - 11:51
#25 - Bank of South Park - 12:15
#26 - Sloppy 2nds - 13:00
#27 - Freeman's Tacos - 13:14
#28 - Photo Dojo - 13:33
#29 - The Playground (Men's Toilet) - 13:50
#30 - The Playground (Women's Toilet) - 14:07
#31 - Big Gay Al's House - 14:21
#32 - Nichole's House (Garage) - 14:42

Top Road (Left to Right)
#33 - City Wok - 15:24
#34 - The Peppermint Hippo - 15:41
#35 - Raisins - 16:45
#36 - South Park Senior Center - 17:05
#37 - Token's House - 17:26
#38 - Bijou Theater - 18:02
#39 - Tweek Bros Coffee - 18:45
#40 - Tweek Bros Coffee - 19:47

Trophy Unlocked:
Boy Love Aficionado
Find all Yaoi art pieces