LOTS of kissing scenes throughout.
When Sammy and Abigail are a couple, there are many scenes of passionate kissing and at a party, they go into a room, and kiss passionately. It seems they are about to have sex, but they stop before they do.
Sammy and Ollie (also a boy) kiss as both are gay.
At Kat's bithday party, her boyfriend kisses her passionately in a room; Kat is drunk. He is wanting to have sex with her, but she tells him to stop many times. He doesn't until Christian comes and stops him.
Some scenes have girls getting changed. No nudity but you see them in their lingerie. This is not meant to be sexual in any way.
At the beach, we see girls in bikinis.
In a scene in one episode, Abigail says she is upset because of the size of her breasts as they are getting larger which she refers to as "this". Kat, in reply also says she has large "this" and then says that not all dancers have flat chests.