I think I might be able to help you with some of them. From left to right, top to bottom.
Try beating the game and once you have all the checkpoints, you can easily teleport to them.
1. Grandpa and Woman: Located at the Evacuation Center (Translated), go left from the checkpoint and enter the first door. Go up two flights of stairs, on to the third floor and enter the first door you encounter. It should have red DNA shaped figures on the floor and head to the right to find a woman and a grandpa. The grandpa is sitting down. You have to also have beaten the karate girl, located at the Maneuvering Room (Gallery), at the top right corner, with the three portals for the boss battle. She's in the pink portal. (Thanks Zeph!) Once you beat the boss, you get the charm ability. Equip it and stand right next to the woman and blow a kiss using X. In order for the kiss to work, you must be right next to her and there must be the red arrow pointing to her. Soon, the woman kisses Airi, and then the grandpa will follow. That's how to get that scene.
2. Woman: Well, it's just like the above scene, but before the grandpa comes in.
3. Guy sitting down and rubbing Airi's genitals:
4. The man who kisses Airi and rubs her breasts: So, he's in the same area as above, but he's in the first floor, second door. Simply use the kiss spell also to activate this scene.
5. Guy with pickaxe, kissing Airi: ???
6. Guard/Gatekeeper: That's a guard who kisses Airi. Simply go to any guard or gate keeper and activate the kissing spell. That should do it.
7. Rose: That's Rose, who can be found in the second floor, and the first room with Noir. Now, I tried the kissing thing on her, but it's just some dialogue, but nothing happened. Either I'm doing something wrong or she wasn't implemented yet, but I highly doubt it. If anyone else knows it, please post it here, thanks.
8. Yellow Fairy: The yellow fairy can be found in the way beginning where you first spawned, with the blue fairy. Simply blow them a kiss!
9. Blue Fairy: (See Above)
10. Man sitting down on a chair: ???
11. Guy who kisses Airi and rubs her...genitals: Just like the guy below, you can find him the evacuation center. Left at checkpoint and enter the first door. He's in the first floor, room one with the fake Airi.
12. Guy who kisses Airi against the wall: (See above)
13. Green Fairy: You save her from the fairy lickers and there is a Green Fairy that you can kiss. Once you do, she brings the other fairies and they all begin licking Airi. Ah, good times.
14. (Kinda) Fat Monster: I can't remember on the top of my head where exactly his location is, but in the gallery, he is monster number 48 in the gallery. Airi has to be incapacitated.
So yeah. There's most of it, but some I'm not sure of. Sorry I couldn't be of more help.