Somewhere else on this forum, someone said something to the effect that sinning may well be fun, but it isn't true happiness.
Fun only lasts in the moment. True happiness cannot be dulled by time. An example I have is memories of my dog that passed away before I returned from my mission. Whenever I think of that dog a smile is on my face, and I can all but see him in front of me.
There is no way that sinning in any form can do that.