Threesome hookup can hardly happen spontaneously. If
you really want to have a threesome, you should go for it. Go to bars no matter
if you are a couple or single. Couples looking for singles and singles looking
for couples. Start a conversation. Introduce threesome to them and see how they
react. If they act that they are okay with it, you can send an invitation. If
you think it is troublesome, you can download a tinder for threesome app. It
can easily get you a perfect match.