It can be difficult, but some make it fairly obvious. At one end of the scale, profiles that have only male pics, but claim to be a couple is a fairly obvious one, especially the longer they have been on site. Then its picking up on other red flags, a single guy thats only on very late at night (had to wait for the missus to go to bed lol) or a "female" who's pics turn out to be from the web. With couples, it can be harder to pin it down, they can have a real profile, in that they are a couple, yet they don't seem to be able to commit to meeting... real life does throw curveballs into the mix (we currently are finding it hard to find time for anything other than work, family and caring for a very ill relative). But the longer it goes on, the more likely it is that they like the idea, the fantasy, of swinging, but the reality is they wont ever actually take that final step and do it. Some may even attend group socials, or even 1-2-1 socials, safe in the knowledge that they can dip a toe in, and be "seen on the scene" but not have to bump uglies with others lol. Some love to swap long, erotic messages going into detail about what they would like to do, collect pics, and generally get their jollies online without having to put in the legwork for real and actually meet.
Sites with some form of verification process are helpful, but this can be a double-edged sword...just because a couple or single have veries saying others have socialised with them, doesn't mean they are a dyed-in-the-wool, bona-fide swinger, it just means others have spent time in their company in a social setting.
Bottom line, it's all down to you and your tolerance for BS...how long do you get strung along, how many potential red-flags do you ignore before you decide to cut your losses and concentrate your efforts elsewhere.
