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Human penis size is described by length and circumference of penis. It is larger than in any other primate. The size depends on arousal level, time of day, room temperature, frequency of sexual activity, and unreliability of the measurement methods. Average measurements are applied. The length is measured along the top, from the base to the tip with the man standing and the penis held parallel to the floor. The circumference is measured on erect penis: just below the glans penis, in the middle of the shaft, and at the base. Self-measurements report a higher average length than those which used medical or scientific methods. Doctors induce erection or stretch the flaccid penis as far as possible. Flaccid length is not a reliable indication of erect length. The arithmetic mean human penis is approximately At birth the penis is between 2. Penis size does not change much during adulthood.