Work hard and do some SEO, keep going and take some help of posting adult videos to get more traffic as well.
you should add good content and also make backlinks with high rankings if you want to get ahead of your cruel friend don't copy him but think something new and i have even heard my friend earning 25$ a day and it is just fun and a lady in manila is used to chat with has a record of 435$ in single day
posting adult videos and get more traffic and earn $5 from adsense? Thanks for the tip dude, that's so gonna make people rich from adsense
write some good article and start link building with directories, social bookmark and get the idea of dp members.
If you want to earn $10 or more, you have to be good article writer, don't hate your friend and leave him, start your own work, your writing practice will give you gold eggs and some days after your friend will come to ask your secrets.
Don't post any porn related content, it is against Google adsense policy. they will banned your account.