Therapeutic Ultrasound As A Potential Male Contraceptive: "We found that 3 MHz ultrasound delivered with 2.2 Watt per square cm power for fifteen minutes was necessary to deplete spermatocytes and spermatids from the testis and that this treatment significantly reduced epididymal sperm reserves." User trot-trot, in the Reddit as it is meant to be subreddit, 30 Jan 2012
Therapeutic ultrasound as a potential male contraceptive: "We found that 3 MHz ultrasound delivered with 2.2 Watt per square cm power for fifteen minutes was necessary to deplete spermatocytes and spermatids from the testis and that this treatment significantly reduced epididymal sperm reserves." User trot-trot, in the WTF?! subreddit, 30 Jan 2012