No. Not all the users are real. Companies employ various methods to create the illusion of activity on their dating sites. You also have to account for spammers/scammers. If you want a more realistic gauge of activity, then take any user number (currently online, total, in your city, etc.) and divide it by 10. At any given time only one tenth of the user base is active and legitimate.

My source: I worked for an online dating company for 2 years.