Crossword puzzle clue "have answers"

How many letters are in the longest answers in this puzzle - or how many of these answers there are

Letter appearing only in down answers; its opposite appears only in across answers

Actor who said "Some people have youth, some have beauty—I have menace"

Sounds you might make when I say "Would you rather watch your parents have sex or have your parents watch you have sex?"

What the ten longest answers have in common

What the longest answers each have two of

What the ten longest answers have in common

Houses with sharply angled roofs, and what this puzzle's four longest answers literally have in common