When getting gay-fucked doggystyle, the aggressor's teabag (dominant's swinging scrotum) can be felt slapping against the reciever's teabag (submissive's stationary scrotum). It's particularly effective with lowrollers.
Submissive dog on all fours is mounted by dominant dog. Anal penetration occurs. In the rythmic heat of the moment, it's just one more sensation to remind own'd that they are being pwn'd. Also known as the pendulum effect.
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