No, OneNightFriend is an authentic dating service. However, like most dating services, there are people out there who will take the time to set up fake accounts alongside a majority of real singles. These are rare since a paid subscription is required to send messages, and since users can report spam members to OneNightFriend admin for fast removal. However, if you do receive a spam message, make sure to report it to OneNightFriend and do not respond. Fake profiles are usually quite easy to spot since the profile doesn't correspond with the message, or an image of a celebrity is used.
You can also spot OneNightFriend fake members from real ones since they tend to send contacts immediately on sign up. You might find that where you have joined as a new member and straight away receive multiple messaging asking you to upgrade your account so you can chat - ignore and report these through the reporting feature, they are not genuine.