The Secret Life of the American Teenager/WMG
The show's romances are just a build-up to the finale.
The series will end with a Tenchi Solution.
Ricky's frustration on not having Sex with Amy would lead him to do so with Ashley.
Ashley have the hots for Ricky, so it might be possible he do it with Ashley if Amy holds him off for so long.
- A moot point, since Ricky and Amy have sex in the season three finale and have been going at it like rabbits ever since