Since you can contact matches through an online dating service's internal communication system, there's no need to reveal your address or phone number.
When you do communicate with other members, keep in mind the possibility that any stranger could be a liar or a scammer. Don't enter into any financial arrangements with anyone you've just met.
Many do find what they are looking for, whether that is a casual date, a committed relationship, or an intimate encounter.
But for the most part, users who find compatible partners are the ones who are willing to dedicate time and effort to the process.
One possible solution would be to create two accounts on the same service. Unfortunately, many users will not bother to respond to messages from matches who do not fit their criteria, and some receive so many messages that it becomes impossible to respond to every single one.
While gender ratios vary from one service to another, surveys have found that, overall, there are roughly equal numbers of men and women using online dating services.
While you can find plenty of users as young as 18 on any matchmaking website, the majority of users fall between 35 and 55.
Most online dating services allow you to see what other members are seeking in a match, so you can gauge whether they are likely to reciprocate your interest.
It's perfectly acceptable to communicate with several matches at once, so don't hesitate to indicate interest in multiple matches simultaneously, increasing your chances of receiving a response.
While an online dating service can make the search for love far more efficient, it can't do all the work for you, nor can it create potential matches out of thin air.