Enter a gender after excitement period, phallic sponge body congests, white film by take up, phallic hyperaemia erects, scrotal skin hyperaemia is added thick, then scrotum hardens, fixed.

• 进入性兴奋期后，阴茎海绵体充血，白膜被绷紧，阴茎充血勃起，阴囊皮肤充血增厚，继而阴囊变硬、固定。