Graded Age of Consent Laws

Why not propose a scheme along these lines?  The first number is the age of one partner, and the range of numbers is the range of people of a certain age who can legally have sex with a person of first.  It goes for any combination or number of sexes.

14: 11-17
15: 12-18
16: 12-24
17: 12-25
18-21: 14-up
21: 15-up

The thing that really bugs society is the whole ADOLESCENCE/children question around the consent laws.  In theory, we have no immediate moral problem with a 25 year old fucking an 80 year old, since both of them have made the mystical transition into adulthood.  However, we say that a 40 year old and a ten year old is RIGHT OUT.  To quantify the ages so precisely around adolescence seems strange, as well.  To accomodate this, we could have less nasty non-jail sentences (seeing a shrink/community service) for, for example, an 18 year old tapping a 13 year-old), all the way up to whatever age is right-out.  Send a 25 year old who got with an 8 year old to jail.  The process of fixing the age cutoffs could be helped by the psychological establishment.

You guys act like pregnancy is the rule in teen sex and not the rare exception.  Wouldn't it be an easier and practical solution to concentrate our efforts on contraceptives, abortion rights (if you're a supporter), and STD cures/preventions?  I mean lets face it, even in conservative places sex among teens is probably rampant, just as it's always been, everywhere.  Remember when you were a teen?  Sex will happen anyway, lets bring out the education and the condoms.