^Doesn't irritate me at all. There's a difference between finding a television performer nice to look at and deluding oneself that there's a nonzero chance of a relationship with them.
Besides, sometimes there are people that you find very pleasant to look at but whose personalities do not predispose you to want a relationship with them. Peri in her first season or so was like that -- hot, but whiny and annoying. She did get better in her final season, though, as I said.