Oh, and if you're outside of what the ad wants?
Skip it.: Focus on posting an ad instead of replying to them, and know that there's a good chance it'll get flagged within 24 hours. There are a great number of folks on CL who are bitter, angry and/or frustrated with their lack of hooking up, and they'll automatically assume anyone who seems 'normal' is a prostitute.
Share yourself genuinely, be clear and specific about who you are and what you're after, and make sure you use that flag button at the bottom of each message as often as it's needed.
It offers a high degree of privacy if you're also seeking a romantic relationship, and you can target your profile precisely to what you're after.
Everyone who joins has to pay to gain access - a great filter for 'professionals' or lookie-loos - and their set-up is pretty swanky. The majority of the site's users are North American; folks living in Asian or Europe might struggle to find anyone.: Show something provocative in your profile, minus any nudity. Take a peek at your competition, and make sure that you're avoiding all the dating cliches.
Use the search feature heavily, and make sure to only contact ladies whose criteria state they're after someone just like you.
For open-minded, adventurous singles and couples, Fet Life might be something to check out.
If there's one type of'dating site that has blanketed the internet, it's those that cater to folks seeking something more casual.