Here are my top three...

#3...In a large room with a fire place with about 13 other people sleeping including a priest

#2...In the woods behind my house (situational) 3 guys on me while my girlfriend and her friend watched

#1...My all time favorite...On a fire escape overlooking Madison Ave. on the Upper East Side at about 4-5 o'clock on a friday afternoon this past summer. YAY!

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HAVE FUN!! Do what ever feels GOOD!