I've had a threesome - a few actually, college night club scene is a lucrative grounds for this -all with random encounters - nothing to write home about honestly..
This year's valentine's day me and my bud scored 3 chicks so that would be a 5-some - it was good but probaly because of massive amounts of coke as opposed to sex
From a personal perspective: nothing is on par vis-a-vis one on one - complete and undivided attention on each other produces unparallelled levels of gratification/satisfaction and sensuality
done the 3 way and 4 way; 3 way is trickier because if 2 of the 3 are really into each other the third gets left out; in the 4 way, it can turn into 2 pairs. Butt, it certainly beats watching porn!