Just to let you know...i'm the 1st guy that voted "good" on your poll.
I find tongue rings a turn-on (for obvious reasons). I would recommend to get a ring besides the standard metallic color. Colored/designed ones look cool. As long as you get a cool ring...go for it. :)
I think it's a turn why would any girl make a piercing in her tongue, how come she eats or sleeps or kiss...i would never accept my girl to do this cause it's a total turn off for me and he tongue is a lot better not pierced and looks fresh...why would I want a piece of a metal dirt stuck in her tongue...personally I voted for bad!
I have a high tolerance for a lot of different things. Tattoos: hot, Earrings:normal, bellybutton ring: hot , nose ring:slightly less hot but okay. but for some reason the idea of you having poked a hole in you tongue and or lip, seems to be were I draw the line. Personal choice, I don't like
For kissing I think it would be a turn off but for oral it would be interesting. Why? A piece of metal in my mouth doesn't seem exciting but it could add an interesting sensation on other areas. I've never experienced a pierced tongue though so my opinion is just based on my imagination.