Not a new topic, I know; I was just going to bump the one I wrote a few years back, but couldn't find it.
First of all, get a sim card which is just for your "swinging" friends, you can swop real numbers later, with those who become real friends.
It's worthwhile confiding in someone who you can share certain info with. They don't have to know what you're up to, just tell them you're going on a first date. "Phone a friend", it's what many call girls do, and it's just an extra to help keep them safe.
Always arrange to meet in a public place, and don't be shy about asking a friend to tag along. If your meet is genuine then they won't object to you considering your safety, nor will they feel they need to be anonymous.
If you are going to an address or a hotel room, check it out, and let someone know where you're going. Don't ever be diverted to a different location from that which you had first arranged. Apologies for the dramatics, but if he said I'm in room 22, but meets you in the bar and then wants to take you to room 32 ?? alarm bells should be going off.
Never get into a car with someone you don't know without first, at least, sharing the car details with a friend.
There are people who just want to identify you, and to find out where you live, so be cautious when handing out information. From my own experiences, these people are usually just time wasters, and I didn't really worry about who knew where I lived, but better to be safe.
I'm sure I've missed something out, but any steps taken to ensure a safe and relaxed meet is worthwhile.