There are plenty of swingers or even regular dating sites, where you will find willing volunteers. I would however, be very selective and meet socially first. The way I started out is a little unusual, I decided to do this myself rather than being something my husband wanted, but, still I had to feel comfortable before going ahead. There is no way I would have just said yes to a random person.
It isn’t quite the same as dating when looking for love, but many of the same expectations apply. I would have to like the person, feel that they were friendly, considerate and were not some deranged idiot that would relentlessly pursue me.
The intention is not to become best friends, but just to meet a couple of times in a comfortable social setting, so that questions can be asked, concerns and worries addressed, to generally feel ok with going ahead. This will likely be the case for the first few new encounters, but over time, it becomes less of an issue, and I suspect if your partner is like me, they will soon develop a sixth sense, where they can quickly spot the idiots and won’t need so much time to select the right people.