If an SM is saying they need to be discreet, that is another red flag that it's a guy that's cheating on his wife/gf. If they need to see a nude right away, that's a red flag that it's a picture collector only.
Usually, neither of these will spend any significant time on their profile. One thing that you can do is to focus on people that have put some very obvious effort into their profile. These are the ones that will also be more likely to put more effort into actually meeting.
As GGMM mentioned, LS parties/events bypass all of this BS and are easily 10x more productive versus trying to set up a meeting online. If you are experienced swingers and at all social, that is going to be the way to go if you really want to meet people and play. Then, if online meetings happen, it's just icing on the cake.

