You'd have to be very rough on yourself to cause damage, and it would probably hurt before you got to that point. The testes and associated ducts are actually pretty tough. However, be extremely careful about incorporating any artificial objects into your masturbation that could cause damage, as this greatly increases the risk. An example would be constricting your testes with string or a rubber band – bad idea. While it may be exciting at the moment if you're into this kind of feeling, the genitals were not designed to be abused in this manner, and your pain threshold goes up when you're sexually aroused. In the excitement you could tear internal tissues or, worse, restrict vital blood flow to certain areas. This could result in a very ugly scene. You don't need to treat your family jewels like...well, family jewels, but treat them with respect and use common sense. You get only one set of genitals in life, so use them wisely.
Do you find yourself masturbating more often during some seasons than others? Why?
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