"Blue balls" is a condition related to epididymal, high blood pressure in men, it occurs when men remain sexually aroused for a long time but are unable to orgasm or ejaculate. It is quite common. It is not serious, but there may be pain in the testicles after erection without orgasm. In such a condition, the color of the balls of men becomes light blue, so it is called blue balls.
(Read more: Fear of sex in men)