There's one thing to hack the code into the military base.

First mini-missions for 2-players, the download descriptions below:

Updated: 05/12/2016

The model selector that use anywhere to 60+ models for second player, type "p7" to spawn and change models (Also they have different combat abilities) I separate each models for San Andreas/Underground and it can be use the list will be below instead of picking 5 models in original 2-player modes and I also add in the distance hack so it doesn't end the game anymore if your driving such as airplanes. I tested in GTA Multiplayer and it's works but however the auto-aim is disabled in multiplayer and it will be hard to kill other players. You need the auto-aim hack mod.

Cheats:
p1: Spawn your favourite Girlfriend as seen as in picture
p2: Spawn 3 different actors, friendly, foe, and rival
p3: Spawn buddies
p4: Spawn others
p5: Spawn a girl
p6: Spawn a love one
p7: Spawn 60+ different actors
p8: Spawn Girlfriends
p9: Spawn Strippers
p0: Spawn Bums
p-: Spawn Random Guys
p=: Spawn Single First Guy
p`: Spawn Single Second Guy (Sometimes it doesn't work)
o-: Spawn Single Second Guy
hackx: Removes the distance limit
kungfux: Player 2 learns karate moves
boxingx: Player 2 learns boxing moves
kickingx: Player 2 learns kickboxing moves
normalx: Player 2 learns normal moves
friendx: Both Players are friends
foex: Both Players are friends of foe
rivalx: Both Players are rivals (Steal separate cars)

(New)
Cheat:
sexx: Have sex with the second player
sexyx: Have sex with the second player and make the second player vomit
cx: Give access to second player cheats (give player 2 some weapons and god mode)
CTRL + C: Give access to cheats for player 1

Key:
Pause/Break:Kiss the second player


Download the 2-Player Mode Pack:
http://www.mediafire.com/file/fl533oe8jd94034/2-Player+with+more+than+Aminations+v9.0.rar
Note: This is updated version includes piss animations:

Codes:
piss1: Player 1 Pisses
piss2: Player 2 Pisses

PAUSE: Kiss Player 2 A
SHIFT + CTRL + Z: Both Players Kissing Each Other (Loop) (Tab or F to exit)
SHIFT + CTRL + X: Have Sex on Player 2 (Tab or F to exit)
SHIFT + CTRL + C: Have Sex on Player 1 (Tab or F to exit)
SHIFT + CTRL + HOME: Kiss Player 2 B
SHIFT + CTRL + END: Kiss Player 2 C

Note:
Now, I fixed kisses and sex in the right position, instead of a broken position. Simply press SHIFT + CTRL + Z to Kiss or press SHIFT + CTRL + X to have sex, to get out press F or Tab to cancel the action.


Cheat:

hurtx: cannot shoot player 1
hurt2x: cannot shoot player 2

You can play with each other or control both players for extra fun if you have SAAC2.

Download the SAAC2: https://www.thegtaplace.com/downloads/f5876-san-andreas-advanced-control-saac-12

Download the Pre-set for Xbox 360 and Keyboard: https://drive.google.com/drive/my-drive

It works on every map mods, and GTA United, Ailen City, Underground any version. I test it different maps but THE ONLY ONE DOESN'T WORK IS GOSTOWN PARADISE.

cheat:
bed1: Player 1 sleeps
bed2: Player 2 sleeps
dancex: Both Players Dance Together
sex2: Player 2 act like a stripper
food2: Player 2 eat food
game1: Player 1 plays casino game
game2: Player 2 plays casino game
g1: Player 1 plays video games
g2: Player 2 plays video games
talkx: Both Players are Arguing
kissx: Both Player do a shy kiss
sex1: Player 1 act like a stripper
food1: Player 1 eat food

Note: If the second player is not enable, with the wrong cheat codes CRASH THE GAME if second player is not there.