Activating this trainer:

Press F1 at main menu.

Listen for 'Trainer Activated'.

Press desired hotkey. All hotkeys can be changed on the trainer.

Trainer Options:

Numpad 1: Easy Get Stars Unlock Girls

Numpad 2: Quick Remove and Destroy Clothes

Numpad 3: Unlimited Lives

Numpad 4: Invincible

Notes:

Numpad 1: Easy Get Stars Unlock Girls - enter HD Mode, toggle on, then leave then come back and more girls are unlocked.  Repeat to unlock them all.

Numpad 2: Quick Remove and Destroy Clothes - you must have first shot some clothing that has the red HP value shown.  Toggle this on and most clothing with HP will destroy instantly.

Numpad 3: Unlimited Lives - you need to have died once.  Toggle on and you have unlimited lives.

Numpad 4: Invincible - you need to have taken damage at least once. Toggle on and nothing causes you harm.