Female competition is when you are with a guy you like, and you look around, see that you're the prettiest girl in the vicinity and feel a huge sense of relief that there's no one to take the attention away from you. (Female competition is a result of women feeling like their greatest sense of self-worth, identity and influence comes from their sexual appeal to men. Many women don't even realize they are feeling this way, and it's a subconscious thing, but they notice themselves getting jealous when they see other women who they think men would find sexually appealing.)

Embrace Your Sexual Self: A Practical Guide for Women