Sexual or affectionate thoughts about someone you have never seen?

Is it possible to lust after or feel affection for someone whose face you have never seen, since you've only been talking online? I'm talking about situations where there's an emotional, somewhat romantic connection between two people, but without knowing what the other person looks like, except for their age and physical description. I don't mean people whom you haven't met in person, since then these feelings would obviously be normal.

Sexual or affectionate thoughts about someone you have never seen?
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