But it has always served as not only a physical barrier, but a psychological one to intimidate potential invaders.

但是一直以来，它不仅仅是一个实体屏障，也是一个能威吓到潜在入侵者的心理屏障。

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In others the physical problem can be temporary while for some the treatment has led to a psychological barrier to sex.

BBC: Prostate cancer therapy 'can damage sex life'