My balls go up when I masturbate?

I know it's normal for the scrotum to tighten when guys orgasm, but my balls go up all the way when I'm jerking off. When it happened for the first time I was scared that they'd be stuck because they go all the way to the base of my penis. Why does this happen? Does it have anything to do with tighter... show more I know it's normal for the scrotum to tighten when guys orgasm, but my balls go up all the way when I'm jerking off. When it happened for the first time I was scared that they'd be stuck because they go all the way to the base of my penis. Why does this happen? Does it have anything to do with tighter skin due to being circumcised? Anytime I've seen it happen in porn the guy's always cut. I'm gay btw but my uncut boyfriend has never had this problem.
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