As a result of sexual stimulation, the spongy bodies inside the penis (the corpus spongiosum and the two corpora cavernosa) become tumescent, i.e. are filled with blood.

• 作为性刺激的结果，阴茎内部的海绵体(一条尿道海绵体和两条阴茎海绵体)开始膨胀，即海绵体充血。