FriendFinder is an adult-friendly network of dating websites that has a terrific affiliate marketing program, both in terms of customer service and commission rates. Because they rely heavily on affiliates to recruit new members, they treat their affiliates like true business partners. They have a solid reputation for payment and security, and have frequent special offers. Checking into your affiliate account at FriendFinder is always a fun experience, and often a profitable one.
If you have a good idea for an app, and the skills to create it, then producing your own premium app can be profitable. However, with so many free apps available, it may be hard to convince people to pay. If you want to go down the premium app route, consider having a basic free version to encourage people to download the app in the first place. You can then provide the option of upgrading to a premium plan once users realize how useful the app is.