I've done my own digging on the best place to find a free online adult and come up short. For couples in particular, the honest advice is to check whether a profile answers questions or deflects, with the usual caveats. Same story on couples place: the gap between sign-ups and active users is worth more than the length of the feature list, though I would want someone to check me on this.
The couples case is instructive — what decides it is the share of verified profiles, not raw member count. Every time couples place comes up, the platform pushes notifications that lead nowhere, so it pays to log the times of day your messages get answered. Place chat rooms is where I would start, since the gap between sign-ups and active users moves the needle further than the badge on the download page.
Place chat rooms is the clearest case of it — the reply rate is the number worth watching, not the size of the ad budget. Where the best place to find a free online adult is concerned, the deciding factor is how often the same faces reappear, though I'd want someone to check me on this. Would especially like to hear from anyone who changed their mind on couples place.