oh..my...god you are very.....

all of your reasons were crap. Sorry.

Here is one very good reason, and may contain a spoiler from FFX-2.

In one of the missions you do to get an episode complete, Yuna chases a moogle or something and everytime she sees it, memories of tidus and her days as a summoner keep appearing. She keeps running around Luca chasing the moogle, and then it finally disappears. Rikku and Paine finally catch up to her, and ask what Yuna was doing. Yuna tells them that she kept seeing "him" AKA the one she loves, Tidus, and she didn't want it to be a memory..she wanted him to come back. Then rikku goes on about "Oh i had that with someone once..." And Paine then says, "ok, SPILL IT!" And then rikku says, "You tell me your secrets, and i'll tell you mine!"...You later find out that the one Rikku had great "memories" with is Gippal, WHICH IS A GUY!