Why is my friend so promiscuous?

This has something to do with how her family environment is. Normally, promiscuity results when there is a lack of affection she needs in the family. She doesnt feel the love she needs at home so she misinterprets it that, guys who show false affections as love. It's more of a family background. Or, how is her family... her mother or her father like? This behavior may have just been adapted. Or the attitude of the father towards her may have rooted from a previous experience. I admire your friendship. You really are a true friend having concerns about her. If you think she could take it, why not talk to her for her behavior? Being her close friend you can influence her of how to act decently. Talk to her and let her open up to you. Continue being a friend to her. :D