Currently on first cycle of test c at 500ml a week.. at first I felt like a bull Bro going in, the misses def felt the difference as did I... (very aggressive lol) it does get to a point were its almost like you alwys need or want it.. (gets kinda annoying but after a while (couple weeks) I've calmed down some and seem to be at my normal libido maybe a bit higher.... I guess for me is was the spike (of test) that got me like that.... just my personal exp though... make sure to run a ai to keep your estrogen in check or you could have the total opposite effect... good luck on your cycle