Balls usually take a back seat to the penis. One reason for this is the pleasure you get from your testicles is more subtle than the pleasure you get from your penis. But just because the pleasure is subtle doesn't mean it should be ignored. As one reader comments, "When my wife caresses my testicles, it's one part excitement, two parts relaxation, and six parts bliss. I didn't appreciate this when I was in my twenties, but now I enjoy it as much oral sex. The sensation is different, but just as satisfying."
Testicles are far more rugged than you might think. You can squeeze or pull them with no problem, and they can bang against a lover's thighs with impunity. But pop them with a simple flick of a finger and you might have to peel their owner off the ceiling. Heaven only knows why. They should feel a bit like hard-boiled eggs without the shell, but they won't be that big unless your lover is related to the racehorse Secretariat.
As a man becomes aroused, his testicles tend to swell or become bigger. When he is highly aroused or just about to come, his scrotum and testicles will pull up to hug the shaft of the penis, some more than others. Another thing to know about testicles is that they can easily go from feeling soft to hard. It depends on the temperature and on the man's level of excitement.
(continued in book)