Steven Tyler -- Doesn't Slack Off at Nude Beach

Steven Tyler got an X-rated peep show at a clothing optional beach in Maui this weekend ... but the former "American Idol" judge kept it strictly PG by leaving his fancy women's palazzo pants on amongst a sea of bare-ass sunbathers.

The 64-year-old Aerosmith front man is so enamored with the silky slacks that he was spotted still wearing them the very next day.