well I never participated in a threesome but I did witness a few in my time. It was never my or my ex's thing. We just enjoyed each other until she didn't like me anymore. Plus, there's no way on earth that I could handle that situation anyway. It takes a special kind of mindset to get involved in all that and unfortunately I'm not emotionally or physically equipped to handle it.
Not saying it's wrong, just saying it's not for me.