i say just come out with it... say u want booty and ask her y she aint puttin out!!
there are very few reasons y shes not
1: the pill
2; Lots of stress...work... home... self-consious
3; intrest in somsone else
4; getting it elsewhere
5; just doenst feel like it
6; doest feel for u that way much.. or anymore..
7; .......i can go on and on
i've been there, u have to figure out this one on your own bro!
i've gone about that time maybe a little more in my last relationship without sex, tho i wanted it bad... but sometimes too much sex makes u take things for granted,.. looses its intimate touch.
her and i would coudle, kiss....all the affectionate things without the sex...
if thats whats happening... then i woudlnt worry too much about all the negative possabilities.... but bring it up... tell her ya want it, and ask her y your not getting it... but dont be so blunt... or u will continue to not get any.... at ALL! lol
good luck!