Girls, what boundaries do you think I should have with female friends?

My girlfriend and I have been arguing about me being friends with other girls. I understand some of her concerns because the girls are a lot younger and thinner than her, but there's literally zero chance I would let any of these girls have sex with me. They're gross and sleep around a lot anyway, so just not my type. But my girlfriend thinks it's a problem that I hang out with them and go places with them, but she has guy friends, so I'm not really sure how that makes sense.

I'd appreciate some perspective here, and want to know what boundaries are reasonable to accept. Like, what boundaries do you keep for your SO?
Girls, what boundaries do you think I should have with female friends?
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