I've had libido ups and downs while on test. It doesn't necessarily mean you're going to be a raging boner all the time. Hormones will fluctuate - there are so many variables in terms of diet and stress here that I don't want to think about it.
I notice the biggest surge when I take 10mg of aromasin with a 75iu shot of HMG which usually lasts a few days.
So far my current test/tren + dostinex has given me the most consistently ridiculous horn-dog sex drive (I'm talking 3-5 nuts per day, every day possible). The kind of libido where I have to leave my desk and go rub one out in the bathroom so I can focus on my work.