I have used the rule that the rules for a threesome is that the three people involved set the rules for the encounter! No standard rules like golf because, frankly, each threesome I have been in was with different types of people. Hence, set rules depending on the wants of the people involved.
Speaking of threesomes - does anyone know of how I can contact people in the South Bay area of Los Angeles who are interested in threesomes with a bisexual mature man?? Looking for people who are in the age range of 50 - 80 years old?