How to tell your significant other that you want to have a threesome?

How to tell your significant other that you want to have a threesome? I suggest that you should take baby steps according to different circumstances. If you are already very clear that she is into it, you can speak to her directly. If you don't know for sure, you should first get her to talk about threesome hookup with you. Do not bring the proposal until you are sure that she will be on board.