Well, I think they can seem more beautiful because they are a fantasy. We can image our crush however we want, controlling them in our minds like they were some kind of life-sized puppets. We're not seeing a real person, we're seeing the ideal we wish we could see.
But to me it's more like watching a television show about travel rather than getting up, getting your passport & hitting the road. It's nice, but it's not the real thing.
Sure, we eliminate a lot of the potential dangers by keeping the fantasy, but we also lose out on all the benefits.