Not everyone has had the luxury of being able to participate in a threesome.
Not that you want to make that third wheel a slave, but it's nice having a third opinion on what you and your partner should do next.
Having a third wheel during a date does have its own merits like having someone to take pictures of you and your partner, or having someone carry your things while you and your partner enjoy the sights and sounds of wherever you are. Not that you want it to be completely different, but mixing things up does add spice to things that might have become too repetitive due to having the same circumstances every single time. Why is that, you might ask? Well, first of all, there will be times that you'll get bored or fed up with doing things over and over again. But one thing is for sure - adding one more head to what are usually intimate moments actually makes it more exciting. That's definitely true, especially when it comes to things that are supposed to be intimate like romantic dates and passionate sex.