Tail strikes occur from time to time, mostly on longer models such as Airbus A340 or Boeing 767 and 777 jets, but safety experts said they are particularly unusual during takeoffs of 757 jets.
I'll have to agree with that statement. The 75 is not that light in pitch compared to other planes I've flown. Also, the tail clearance is fairly generous for a long aircraft.
A couple of the classic causes for takeoff tail strikes are setting the airspeed bugs wrong and trying too agressively to achieve the 'ideal' 2 degree per second pitch rate they harp about in the sim.