Having a sword fight with tongues is a lot of fun if you both want to stick your tongues into the other's mouth but if one of you doesn't want to, it's not fun at all. If someone tries to shove his/her tongue in your mouth and you don't want it in there, it's disgusting.
I remember a New Years Eve my wife and I spent at the local eatery when we were in our 30s. When midnight came everyone was well lubricated from sitting at the bar and we made the rounds kissing everyone who was close enough. This one girl I had known in high school locked lips with me and we had a great sword fight going when she wrapped her tongue around my tonsils. I tried to reciprocate but mine wasn't long enough. It was fun and I enjoyed it but I can think of plenty of other women I would not want to do that with.