Before you enter such a relationship maybe you should sign such an agreement (below). For although this looks like fun 
there are points one must take into consideration before such action is taken. Here’s a example of such a contract but please have your legal team draft their own and have it as prepared as other protection you might carry in case such events occur.
I _______ (state your name) under no undue influence (have their alcohol and drug results as negative) agree to such relationship with ___________ on _____ at ____________. These relationships include___________ but not_________ and agree to this occurring between __________ and ______ hours . I further state that we both are clear of the following sexual transmitted diseases_______________ and that we agree to not move ahead on any decision if something/someone else results from said action without a further signed contract. Further note I concur that I am legal mental and age requirements in ______ state to make such agreement (copies of drivers licenses might be helpful) in good faith.
_____________ _____________________
Signature Notary Signature
FOOTNOTE- Maybe it’s best to wait till you are married.