Why is this?

I am guessing it is either due to LH rising or E2 lowering.
The increase in libido is short lived, so if its LH then that means LH desensitisation kicks in quickly, or if its E2 then what would be the explanation? if T is low does E2 rise after afew weeks to make up for it? pmgamer you are on HCG and Adex so you should know, what improved your libido the most, HCG or arimidex?