Elastic around dick / balls ?
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I've seen it in a lot of videos and I was wondering why are they doing this? They got a sort of elastic around their dick and balls. What's the purpose? Does it make them last longer before cumming?
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You may be describing a kind of cockring. I guess it's usually used as a means to facilitate erection.
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Yes, this is a type of cockring. It makes it harder for blood to leave your penis, so you can keep an erection longer.
We probably see them in porn so much because a professional porn shoot will take so long to film, with many pauses, commands from the director, and so on. A lot of men like to wear them while having sex, too, to keep their erections. Just be careful if you wear one – having one too tight or leaving one on more than an hour is usually not recommended, as it can cause serious damage.