I've always found the most, shall we say, "fruitful" RSVPs have come from attending conferences, festivals, and themed events where you already have at least one common interest with everybody there.
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Okay this one is a bit cheeky because all social networks have apps, but let's just say you're using one of them on your desktop. As I wrote earlier this year with a guide to dating on Instagram , social media is still a great place to make connections that may lead to casual sex. On Facebook, you can connect with someone from your past that you never managed to hook up with. Maybe it'll go somewhere now you're both older and more experienced.
Instagram is great for direct messaging people you think are attractive, but make sure their follower counts aren't too high if you want to actually get a response. I've not known anybody to enter into casual sex via a Twitter connection, but I'm sure it happens — tweet geeks need sex too and they're always the first people in-the-know.
But you can't just DM somebody with a request for sex though people do try ; on social media you must play the long, tactful game and prepare to be disappointed most of the time. I'm going to let you in on a secret from gay men. Even before dating apps, we were still having much more casual sex than our heterosexual counterparts. We have a unique, shared, non-verbal language and it's something anyone can learn.