Yes, there's sex, backstabbing, maniuplation, friendship, teamwork, hard work, sort of drinking/drugs, eating disorders, abandoment, marriage, lying- but most of which are done with constructively.
The main character with an eating disorder has gotten help and admitted it, and talked openly about how she's a stronger person having dealt with those issues. She's a pretty decent role model, kind, hard working, cares about the team and her friends.
Main character who worked really hard only to get seriously injured in the first season, constantly overcomes challenges. She supports her team, always does what's right, encourages her friend to make good choices, reminds them to focus on their goal, and overall is an excellent and inspiring role model.
Her mother as well really highlights the dilemma of being a parent and how to handle various decisions. She always makes choices for her daughter's interest and is constantly shown thinking and examining her decisions.
Lauren, snobby main character fluctuates from being mean and awful and showing emotion towards friends or demonstrating her pain at being abandoned by her mother as a child. The mother was a crack addict, whom the character struggles with her feelings towards, although after her mother's death she learns her father kept the mother away long after she was sober. The character isn't a good role model but she does show why bullies are the way they are, she does a good job of showing the pain and hurt they are dealing with. The actress is wonderful.
In the show, teamwork always prevails, and they learn to work together- there are negative things but those are dealt with and addressed. I'd let your kids watch if 14 and over but know your kids. If you want, watch with them and discuss the issues, its certainly entertaining and decently acted. There are great adult role models as well as not so great.