I think the number of people who cheat on their spouses ONLY at conventions is very low. Those I know who habitually cheat do it all the time
As far as lying and trust, I don't see it as a lying and trust issue. I see it as an ego issue. They usually have either a very low opinion of themselves and need to build it up by cheating or a have a very big ego and think the "rules" don't apply to them.
And I do agree with Elli - there are MANY ways to cheat which aren't sexual. And of course, swingers are except from this conversation - they are being honest with their partner
