whats the fun?

I an asian, married to someone I loved but like to share me with other men.At times he joins,and at times he just watched.He does all the arrangement and will tell me when.I dont deny,I enjoy it too and not complaining, but my question is,what is the REAL fun of it to a mens point of view.Until today,I just cant fiqure it out why men seem to be so keen to have their wives bedded by other men.For the ladies, if she agree like me, well,not much to complain.We get all the sexing in our life.But the men,just watching,is it really fun? My hubby at times brings home 2 men,big men,at times blacks,and he just watch when they tire me out.Isnt I get more fun than him?I dont understand.