Is when the male partner's balls repeatedly smack against the female partner's vagina while perfoming anal sex.
Martha really likes the double doppler effect when I am doing her up the butt.
作者 Frances Wates 2006年6月19日
when both male testicles are placed in the female anus
I gave Sherri the ol' double doppler last night and my balls barely fit!
作者 dopplehoffers 2011年2月23日

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