Several characters wear thongs throughout the movie, both male and female.
Some kissing and strong sex scenes
Lots of topless women throughout the movie.
Moondog (Matthew McConaughey) is very briefly shown urinating and his penis can be seen for a second or two. His scrotum is not seen.
A man gives a woman cunnilingus, and gropes her butt at the same time. She moans and climaxes.
A lot of people wear revealing beach wear. Especially at parties.