Caught my girlfiend having sex with a 14 yr old

Umm point is she cheated, move the hell on

Call the police, she raped him.

He's 14, a minor. He can't say "yes" to having sex. How long has this been going on?

Why are you still with her? If she's cheating on you, and thinks nothing is wrong, then move on. She's immature.

That is illegal and you could and should report them. I know hard to do as she is your gf but she needs to be talked to as that is not right and or normal.

She certainly needs the police called on her.  I mean, let's assume (hypothetically of course) that the situation was reversed and you were "enjoying the company" of a 14 year-old boy.  What would she do??  It's a pretty safe bet she'd rant and rave like something possessed and then have you slammed behind bars as a sexual predator.  Treating her any differently just because she's female is a huge double standard.

How do you know he was 14?  Do you know him?  If not, your story is a little suspect, since neither of them would have blurted out his age during the discovery.  The fact you know he was in the middle of ejaculating inside her also sounds like your internet post is a story straight out of your imagination.  Did you make this up just to see what people would post in reply??  If not, tell the story again - how you managed to catch her when she was doing something that secret and what happened afterwards.