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The code changes based on your selection. ______________________________ ______________________________ ______________________________ The code has been copied to your clipboard. Video size ____________________ width x ____________________ height pixels 0:01:39 (BUTTON) '¶ 0:00:00 /0:01:39 (BUTTON) '¶ '¶ Direct link * [44]270p | 4.6MB * [45]360p | 6.3MB * [46]720p | 45.6MB * [47]1080p | 30.0MB Share * [48]Share on Facebook * [49]Share on Twitter * [50]Share on Google+ * [51]Email to a Friend Just in time for Valentine's Day, researchers discover a hormone that can enhance activity in the brain associated with sexual arousal and romantic love. 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