You, she and her friend

Right now we'll talk about you, your girl and her friend. Not her boyfriend, just a female.

You've exchanged phones and e-mails. They live together. You can't even get whether they are students or prostitutes.To go for a walk with to of them ? To invite your friend ? It's not that good.

Okay, let's take a look @ this 2 variants, and chose that one that's better.

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To call both for a walk.

Positive: 

• You will get closer to both of them, so later you could choose one of them that you like more
• 
  
• The competition can happen between them for you. Just relax and enjoy
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• They won't get bored together
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• If you're lucky, you'll get the groupie sex.

Negative:

• It's harder to make an intimate atmosphere
  

To take a friend with you.

Positive:

• Your friend can make your joke fully successful, if it's still not
  
• When you're split into pairs, it's easier to make an intimate atmosphere
  

Negative:

• Your friend can take your girl
  
• Both of girls can pay all the attention to your friend and to forget about you
  

To invite just the girl you like

Positive:

• All in your hands
  
  • 
    
• It's easier to hit the target

Negative:

• If her friend has an influence, she can make your girl leave you
  
• If her friend offends, she can make your girl leave you

__________

So, just think about the positeves and negatives and make your own choice.
Also it's interesting if you tell us in comments what story did you have with your girl and her friend.