The enemy of jealousy is communication, truth, honesty, and love. I know that no matter how 'good' someone else may be in bed, we are still going home together. Sometimes one of us even learns something new that our partner enjoys and we can add to our own intimate times together. Keep talking, set your boundaries and limits and don't exceed them, never move faster than the slowest person is comfortable with (there's no reason to rush anything) and you should be fine. Also, one of our original rules that still remains in place is that when one of us says no, we both say no (no matter what it is about or for)...and if one of us wants to stop, we will happily stop, no questions asked, and take the memories and enjoyment with us as we leave.