It didn't work for Vorik, I know, but I thought did for Tuvok. H'm... maybe I'm wrong. T'pol's was set off by exposure to something or other and was fixed when that was gotten rid of. There was also a mirror when she went through it, but in the mirror she and Tucker had a relationship, I think. I read a bunch about Pon Farr awhile back ago, but it's been a long while.