maybe wait until you meet someone first or have at least exchanged messages with them
I disagree and think that most women experienced in OLD would disagree. When you first start you have this approach but there is so much dross on OLD that if you are after more than a sh*g, it is better to be very upfront.
Meeting someone for a first weeding meeting takes time - travel time there, time spent with them, time traveling back. Assume you met 10 men from OLD, chances are you may be interested in seeing maybe 1 again possible 1.5!
When for most of us with busy lives you could be doing something more fun and productive.
So many men are just after random hook ups or are post-divorce no commitment that if you wait til you meet them you are wasting everyone's time.
OLD is a dire process and conditions people to discount people on the smallest things. You are wasting everyone's time if you are looking for something non mainstream (ie. kids and in a fairly swift time frame) and you don't say so.