A safe word is necessary in threesome dating

Don't think that a safe word can be only used for people who enjoy SM. It can also be used to ensure your experience assuming that you will get uncomfortable about some positions or situations. When you feel that things are out of control or when you don't feel comfortable, you can say it and you can control it from that moment. Having a three way is all about getting more fun and happiness. Don't force yourself to do something that you don't like. However, if the person for your threesome doesn't agree to use a safe word, just don't get there.