" Girls get so many bad first messages in online dating. We're dying to get a message so good it knocks us over. Here's how to do it." Read More ›. The next stage is either to sit and wait to be contacted by a potential date, or to look through the site and proactively start sending messages to. explains the "three sentence rule" for sending a first message on a dating site. " Hey “I don't want to sound perv, but there is really no other way to say this.