Here's the first update. Sorry if it's hard to see by the count if there's more pictures and where they are, but since there was still some order issues in the first version, I had to move things a bit. Changes number-wise will be noted at the end.
The reason this was not called "Undertale Boys" is simply because most of the characters in Undertale aren't only shown as one gender in fanarts.

The characters that will be shown in this gallery are as followed :
- Asriel Dreemurr
- Asgore Dreemurr
- Mettaton (All forms)
- Burgerpants
- Grillby
- Sans
- Papyrus
- RG01 and RG02
- Monster Kid
- Flowey (Both forms)
- Doggo, Lesser Dog, Greater Dog and Dogamy
- Napstablook, Aaron, Ice Wolf and the Nicecream guy.

The torrent will contain a few bonuses, including a GIF that couldn't be added to the gallery for reasons.

Part 2 : https://e-hentai.org/g/905287/954203377c/ (Has way less yaoi.)
Next update : 🕆☠👎☜☞✋☠☜👎

@Psycrowe Simply send a link with your art in a message to me. I'll add them the 17th.

As a side note, since this part is mostly Yaoi, the pairings including Papyrus-Frisk, Sans-Frisk, Sans-Toriel and Toriel-Asgore will be moved to part 2 during its "🕆☠👎☜☞✋☠☜👎" update.
57 pictures will be moved there.

Also in the numbers :
105 new pictures added
1 picture replaced
2 picture removed

Frisk: Female

Toriel: Female

Asriel: Male

Asgore: Male

Alphys: Female

Undyne: Female

Mettaton: Robot

Sans: Skeleton

Papyrus: Skeleton

Monster Kid: Unknown

Snowdin shop owner: Female

Burger Guy: Male

Temmie: Temmie

Seriously, wtf is with this "unknown gender" stuff I'm always hearing? In most cases they are blatantly obvious, have been clarified (Frisk for example was stated by Toby to be a girl, it's Chara that is unknown), or you're looking at BG characters with no portraits. In the case of the third, who cares? The only really unknown ones are the dogs.

Base +17, crunchies +12, kryzrodzer -5, ardm -6, Lysabild -6, Rarer66 -4, keionetwothree +6, Marisa Kirisame -7, thesaltylamb +9, longjhondingdong -6, Hitsu89 +6, loribear -6, Helmed -6, and 5 more...

Frisk does not have a canon gender, Toby has said that multiple times. Also ambiguous and unknown basically mean the same thing so monster kid in the tagging system ambiguous gender.

Base +6, nad +6, Rarer66 +4, Marisa Kirisame +7, magico alverman +7, hentaiusmylife +6, Ilosia +12, loribear +6, Helmed +6, DrunkCat +3, shinnosuke1684 +5, Whydoyourcare13 +6

@blakfayt @Hkaa source about those statement about Frisk gender that Toby made? Just for my own curiosity.

As much as Frisk's gender seems unclear, they're androginous as hell.

Edit: Great gallery by the way! Loved the index :D

Base +6, Rinnosuke M. +13, stabbybelkar +7, loribear +6, somerandomdude33 +6

I drew some (a lot) of skelefucking porn how do I contribute

Base +4, shinnosuke1684 +5

ಠДಠ .... my mind has been expanded.

Base +7

Basically in love now with whoever did those first 8 pics

Base +7, greed1500 +15

The world needs more armless Mettaton EX begging for assistance with an erection.

Base +6, shinnosuke1684 +5

Jesus christ, folks. Did you ever even play the game? When being chara, sans call you "lady" several times. When playing frisk, all you get is the name, the gende ris not told. But Chara is likely to be a girl, unless sans is just trolling.

Base +5, shinnosuke1684 -5, jefftheman51 +2, Futalover10 -4, Rinnosuke M. -25

351 "i an't fix you being a whore" goddamn alphys thats a bit harsh

Base +10