It definitely makes sense. Originally my fiance and I were looking for another couple and trying to achieve a balance in the number of sex partners or whatever, but then I met and fell for one of his coworkers and have been dating him for 8ish months now. My fiance still doesn't have another girlfriend, but we talk to another couple that is interested in all three of us. Not sure if that is really going to go anywhere, but it certainly has made their past few visits interesting.
It can be weird to figure out and I've honestly gotten to a point where I feel like we plan and fate laughs haha. Love really does kind of spring up out of nowhere sometimes and you never know what is going to work or not or when it is going to happen to you.