On this week’s Sex Lives, Brian J. Moylan reports from the wild world of cosmetic procedures for male nether regions, starting with the time he used cryotherapy to freeze his penis. (The shrinkage was intense.) He also introduces the new niche field of “anal rejuvenation,” which includes Botox, lasers, plastic surgery, bleaching, tightening, and loosening. Apparently colorectal surgeons of America are stepping up their games, and targeting a predominantly gay-male audience.