I mean I've only taken test, eq, var and clen. But I've never had any sensitive nips and my estrogen doesn't even get very high. I don't take a AI because of it. The only thing I get is really oily skin and I sweat more. Muscle cramps occur though. I don't even experience any noticeable acne. 3 friends just hoped on recently and they complain about sensitive nips and some other things.
I guess it's a good thing but it's strange how some people react. I even can take 100mcg clen with no noticeable sides really. Maybe a little shaky after I workout.