You are a horny coward.

Deciding that discretion is the better part of valor, and that sex drive is the better part of your brain, you decide to sit and watch. You happily pull out your cock and beat off to the sight of those nublile young girls getting reamed by the alien/demonic-thing intruder.

"You like monster ****, do you?" A voice mutters from behind you. "Then you'll LOVE this!"

You don't even have time to turn around before getting yanked into the shadows by tentacles.