CREATE TABLE table_40081 ("Date" TEXT, "Cover model" TEXT, "Centerfold model" TEXT, "Interview subject" TEXT, "Pictorials" TEXT)

Who was the Cover model in the issue in which the Interview subject was Joan Collins?
SELECT "Cover model" FROM table_40081 WHERE "Interview subject" = 'joan collins'
SELECT "Cover model" FROM "table_40081" WHERE "Interview subject" = 'joan collins'