CDate.com is a casual matchmaking site for people living anywhere. Unlike romance sites, CDate is exclusively for those seeking short-term, intimate relationships. If you're looking for this, it gives a free standard membership plan, but you'll need to upgrade to unlock most access.
Cdate considers itself a matchmaking site, but the bottom line is that it's for flings and casual connections only. The site is geared very much toward the over 30 crowd, at least from my use those are the people are most often bumped into.
Though there are definitely members who are younger - a quick search will reveal those in your area.
Couples are also welcome on Cdate. In all they have about 54,000 members. You can join for free but the bite is that this won't give you a whole lot of access. It's only a teaser. You'll get the obligatory upgrade reminders every time you venture away from the free options.
Paid memberships are available, and give you more options, like a guarantee of a minimum number of proposals (which are requests for an encounter) and unlimited messaging. Everyone joins for free, and you pay when you make your first contact. The paid subscription is for a minimum of 3 months.
Keep in mind that because this site is geared toward more casual erotic relationships, there is a lot of adult content right off the bat. Even as you're registering, you'll be asked about your sexual preferences.