Most people are much less shy when online than they are in real life.Show people your true self instead of focusing on how you look and sound like you do in real life.Matching each other on the answers to a lot of irrelevant questions is not the best indicator of your compatibility with someone else.
To answer your question: it depends on what you mean by legitimate.
Stephen asks: "I am trying to find a 'real' adult dating site. The people on there either do not exist or are trumped up.
It seems all that I have come across do not have real/true information... I sent the company an email to complain, but they didn't reply.
Dating online allows you to meet several different people at once and find out if you might be compatible before ever going on an actual date.
Browse through profiles of locals and decide who you want to send a message that is based on interests and other information listed there.