Make money with sex has nothing to do with the exact meaning of having sex, although it could!
There are several websites for which you can write reviews, and they make payments in return. Other than that, there are several websites which require online surveys to be done for them, and you can be a part of these, and get paid well. There are several people around the world who post projects on websites, and you can bid for such online jobs. There are some websites which charge a particular amount for using their services, so make your decisions accordingly. For such jobs, you need an Internet connection, so as to make and receive calls from customers and troubleshoot their problems. Writing an eBook and marketing it through the Internet can be one of the best ways of earning money online. To make gold for raids and stuff I usually try to play the AH a bit.
There are several websites which provide online auction facilities, wherein, you can sell old things that you have but don't need anymore. Today, there are several schools and colleges which provide online college degrees, and they need online instructors. To get an online instructor's job, you need to hold a Master's degree in a particular field of study, and have a few years of teaching experience. Once you have a decent amount of traffic on your blog, you can put up ads and start getting a steady inflow of money. Although there were times when I wanted to get fast cash through illegal venues, I always managed to stay above the law, and work for my money by earning it legally.
Unfortunately, the best ways to make fast money is by utlizing assets you already have...since we all know, that (99% of the time) you gotta have money to make money. But with a little creativity, and by using resources that are easily accessible and already available, you can make money. Start small, but make wise choices on what you are willing to release, in order to make some fast cash. You can offer your bids, proposals or ideas and make money online for every successful project.
Small businesses and online freelancers actually need all the help they can get with their business. If you have technical skills, you can take advantage of free software to make money online. If you are one of the many who are addicted to blogging, you can actually make money online by doing book or product reviews. That said, there's a lot more that I could be doing with my sites to make them more profitable.