Hymen serves as a protective screen of external genital organs, tell from physiology angle, it is the obstacle of bisexual life, it is to prevent what the penis enters the vagina to cut off.

• 处女膜作为外生殖器的一道屏障，从生理角度讲，它是两性生活的障碍，是阻止阴茎进入阴道的阻隔。