Meet four girls, three boys, all turning 18 and get set to follow their eventful final year at school. Cass is known as Ms. Monogamy, Ashley is a player, Donna is a party girl. But what about Sarah? Her friends tease her for being uptight, but she's waiting for The One. Now she's found him, but is he forever - or is Sarah just his summer fling?
You can also keep up-to-date with Sarah's weekly video blogs on Youtube where she explores teen love and sex issues. Here's the first vlog from Sarah.
Twitter: @girlheartboy #girlheartboy