Can my friends click on my Adsense ads?

No. At least, you can not ask your friends or on your Adsense ad clicks. And my advice is, do not. Encourage others not to click your Adsense ads. It should not, and chances are that you'll get much regret. At first it seems a good idea. You start a website and you sign up for Google Adsense. Once visitors to your website clicks on your Adsense ads you get money. So why not a few friends ask if they occasionally on your Adsense ad clicks. If necessary you click on the Adsense ads on the websites of your friends. Wrong. Never do that! The money you earn with Google Adsense is paid by advertisers who hope for serious customers. If a friend helps you on your Adsense ads then clicks cost advertisers money. And they have no serious customers in return. So that way you actually pick money from the advertisers. Therefore, Google has strict rules for participating in Adsense. You must really well to those rules. Not only because it belongs, but also because Google finds out when the rules. Google throws you from the Adsense program. And if you have luck you will also immediately stop put Adsense payments. You can whistle for the money that you have had credit. Love you so nicely just to the rules of Adsense!