I hate seeing or hearing my girlfriend masturbate. How do I stop

By giving her the d more often.

Why are you seemingly in the position to only be watching or hearing her as often as you do to hate it? What a punk bitch to hate your own partners ecstasy.

>>18123855

Uh, fap to it? Tell her you think it's hot maybe

Set the mood, give D

>>18123855
She's thinking about someone else.

Geez OP, why are you so insecure?

Well, you take a chair, sit right in front of her and give her instructions, make sure she's doing that the right way.
Tell her that she should spread her legs really wide, so that you can have a good look.
Make sure her nipples stay hard the entire time. And also check with your own fingers if her pussy is properly wet. Ask her how many fingers she thinks would fit, and let her stretch her pussy to the maximum.
Make her stop a few times right before she cums and remind her that only you can give her the permission to cum, or else she gets spanked so hard she won't forget to listen to your rules.

If she does a good job, allow her to finally cum and tell her she's a good girl. And if she did all you said really well, maybe she gets your dick too as a reward.

Are you gay?

>>18123855
By not being a homosexual.