As 6.0 ft. 185 lb. male I did all my primary training in a 152 with a small female instructor. That was ok, but when I went for my checkride the examiner was pretty heavy and I specifically recall having to carry half tanks of fuel. I actually flew to the examiners airport, then added the amount I could legally carry to remain under gross. I was terrified of failing on account of a technicality, but as it turned out the guy never asked how much fuel I had on board. All I remember is he was too fat to get comfortable, and he couldn't wait to get us back on the ground.