Saying "sex is good" is not too suggestive.
Saying "sex is good" and flipping up your skirt and fingering yourself would make you look bad.
Saying "I love to f*ck" would also be a bad choice.
You can be a little bit daring, but nothing above PG.
Unless, of course, you're auditioning at a conservative religious school, or something like that.
And also... there's a student board for these types of questions, just FYI.
Good luck at your audition!
Avatar - Isaac, my blue-fronted Amazon parrot. Adopted 9/7/07. Age 30 (my pet is older than me!)