Big Heads
Beat the game with any girl, then at the start screen, press and hold x, o,
square, triangle, up. If done correctly, you will hear a sound to notify
correct code entry.
Unlimited Lives
At the main menu hold R2 and press X and triangle then start a new game and
save it then you'll have Unlimited lives.
Unlimited Ammo
At the main menu press up, down, down, up, right. If you do it right the
screen will shake.
Bounce Trick
In the options menu, sub-menu
"other", the age you enter determines how bouncy the gals are - the
higher ( i.e., the more "mature" ) your age, the bouncier they get.