Girlfriend of 6 months seems to want me to have sex with other ladies

Hello I’m a guy in 30’s. We have what appears to be a very healthy relationship. Have been together now for about half a year. We do practice some mild kink during sex. Several times she has casually mentioned she wouldn’t mind me asking to hook up with other women. We are monogamous and have never discussed having an open relationship or “swinging”. She knows that I’m not bi curious and I know that she is. Occasionally masterbates to lesbian porn. We’ve talked about how much hotter woman are than men.

How should I interpret her casual comments about me asking to hook up with other women?

Is she wanting an open relationship, does she want me to have sex with others as a kink thing, and if so does she want to join in or not be present at all?

Some feedback would be appreciated and maybe some advice for approaching her about this.