Question: how do i get my girlfriend to try a threesome? 

Answer: Well, I've managed to do it twice.  Each time it started with talking about her sexual fantasys.  The common fantasy was about them interacting with another woman. This led to hot bedroom action.  Next, watch movies that have hot sex scenes and discuss them.  Talk about how they made her feel emotionally.  Try "Wild Things" or something similar for the girl on girl action.  Follow that with more great sex. Through the movies, I learned that both were curious about strip clubs and we went together and watched.  Again, hot action followed back at home.  It is incremental -- you have to do it slowly and gradually.  Women's desires aren't that far off from men's.  You must make a woman feel safe in her environment and in their relationship with you or it probably isn't going to happen.  If it doesn't, you will have had a lot of great sex trying, so you are out absolutely nothing.
This question from the Yahoo Q&A forum is categorized in the topic: Education & Reference