As has been said, Ezri violated the Trill taboo by sleeping with Worf
Does it apply when one of the partners is not a Trill, as in this case?
Odan didn't seem to have a problem picking up where he left off with Dr. Crusher while in Riker's body. Then when the new host came along, she still wanted to have a relationship w/ Crusher - no mention of a taboo. (Of course, TNG Trill are nothing like DS9 Trill, so we might just pretend that The Host either didn't exist or dealt with another Trill species.)