Help with Girlfriend's sister.

[Phoenix23]

You've got a few options as I see it:

1. You need to talk about this with your GF, and then let her confront her sister for you.
You've got to be comfortable enough to talk about stuff like this if you plan to marry her.

2. You need to suck it up and confront her sister about this, regardless of what you fear she will think, and set some boundries.

3. Ignore it and stop letting it bother you. But only do this if you won't have trouble not being tempted anymore.

[bluesummer]

If I were you, the next time she changes with her door open, say really loudly "Hey ____ , uh, could you close your door? Everyone can see you changing out here, and it's a little weird."

That way it tells her she's being inappropriate, that you aren't into it, and maybe lets your gf know that her sister is being a twit.