You have nothing to lose, because you're probably not going to date them anyway.
Think of it as a favor to their future first dates. If they do ask, be as honest as you're comfortable with, but be wary of talking smack.
If you're hoping to find true love and they're looking to just hookup, you need to know early on so you can bail if you need to.
If you're in between jobs or currently sleeping on a friend's couch for whatever reason, put that all out there.
You want to pay attention to whether you're asking questions about them, and noticing if they reciprocate.
While you may not love everything they're saying, you need to be open about it.
If you know that you're one of those people who has a hard time making eye contact, tell your date.
Although old-fashioned first date etiquette will tell you to spruce up, be polite, and cross your legs, there’s so much more than that archaic nonsense.It may be rare, but sometimes total opposites do fall in love and make it.Be open to the fact that the night could take you anywhere.While it's always a good idea to keep some things to yourself on a first date — especially in regards to your romantic past, but we'll get to that in a minute — when it comes to things that could possibly create problems while you're dating, you want to put that out there.
Encourage them to do the same, and you'll save each other a lot of time.
You can't really get to know someone if you can't be open-minded enough to give them a shot.