CREATE TABLE table_41913 ("Date" TEXT, "Cover model" TEXT, "Centerfold model" TEXT, "Interview subject" TEXT, "20 Questions" TEXT)

Who was the Centerfold model on 5-88?
SELECT "Centerfold model" FROM table_41913 WHERE "Date" = '5-88'
SELECT "Centerfold model" FROM "table_41913" WHERE "Date" = '5-88'