Why have women's sexual preferences changed so drastically in the past 20 or so years?

>Be 25 years old
>Live in London
>Have prestigious financial career
>Educated at a £40,000 ($55,000) a year private (public) school
>Well read; I enjoy reading up on philosophy in my spare time, especially hermeneutics
>Charismatic and able to converse on a wide range of topics
>Muscular and well-honed body; I lift weights 4 times weekly and partake in cardio 3 times weekly, either swimming or running.
>Refined sense of fashion. I love well fitting suits and long coats.

Yet I haven't had a date in 3 years (since leaving university) and only 2 women have shown interest in me during that time.

Why do modern women go for gangbangers, felons and welfare recipients instead of responsible, educated men?

What's caused this? Because even the person that serves me my fries at McDonalds has one.