Why are most teenage girls in the UK so promiscuous with no sense of self-respect?

First of all, I don't believe that that is just a problem in the UK. There are a lot of promiscuous people (not just girls) in the US too. Promiscuity has unfortuantely become more socially acceptable. It's now considered acceptable to have one night stands and friends with benefits (usually minus the friend part). It really shows the decreasing moral standards of our society.