You are aware what going to happen. Since both you two have limited experience in a threesome, you might have discussed it to each other openly before you make the decision. Someone you are not so familiar with will join you to have sex with each other. If you cannot accept it, please don’t make it happen unless you get ready to it.
Don't forget your partner in the bed. This is a common mistake a couple always make in the first few times. Your inviting a partner into your bedroom make things complicated. You cannot concentrate on your life partner as usual, if you do that you may let the new person believe that he/she is left out. It will never be a perfect threesome dating once you are in such a situation.
Set your boundaries ahead. Boundaries are important in a threesome. Your partner will know what you want to do and what you don't want to through your boundaries. If you want to try something new, there are plenty of things you can to spice things up first. And you can have a safe word to limit those excessive actions.
Don't drink too much before a threesome. It is impossible for you to set your rules in the threesome if you are drunk. You are not able to mention your boundaries and remember them if you are in a drunken hook up. When you wake up the next day, you may feel bad about what happened last night.
Choose a stranger to be your partner. If you want to invite one of your friends to your bedroom, you may ruin the relationship. In fact, you can’t know your friends’ attitude toward threesomes even if you are so closed to each other. You can find your partner on a threesome dating app or a website. There are thousands of users who share the same interest with you on apps and websites. You will definitely find an ideal one to start a perfect threesome dating.