Grinding with girls at parties?

Anonymous
So at the college party scene... How do you exactly pick a girl to grind with?

Are you supposed to just walk up behind a girl and kinda put your arms on her waist and start rockin (that seems kinda creepy), or do you introduce yourself first? Keep in mind the level of intoxication...

Also... What do you do if you have a cup of beer in your hand while you're dancing... like how do you handle the two...

Lastly, Different girls dance differently... if a girl puts her arms straight out like surfing style... do you take her hands or do you just let her dance?
Grinding with girls at parties?
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