I had a similar experience myself. About 30 years ago, I worked as an engineer for the local electricity authority. My work computer was a bit of a lemon with frequent technical problems, so I was always phoning the company's in-house IT support team. There was a woman there who often answered my calls for help. She knew her IT stuff really well and was always able to help me sort whatever problem I had. She had a really sultry voice and a confident and friendly manner on the phone. She had a Celtic name, and I imagined her to be a sexy-looking buxom Irish redhead. As we got to know each other, I started to make the odd risque comment on the phone and she'd respond, giving as good as she got.
After about a year of phone flirting with each other, I happened to be visiting the head office where she worked (I worked in a regional office). I had to drop in to the IT section for some reason, so I cast my eye about, wondering which one she was out of the 8 or 10 women working there. Then I heard an unmistakable sexy voice behind me when she answered the phone to some other caller. I turned around and saw one of the most hideously unattractive women I've ever seen in my life. She would have been in her mid-50's, about 5' tall and weighing 150kg. She had thinning hair on her head, blotchy skin and 3 chins with long dark hairs sprouting out of them. She had fingers like pork sausages which made me wonder how she could use a keyboard without hitting 3 keys at once. I finished my business in the IT office and left without identifying myself to her. In my subsequent telephone conversations with her I was always polite but way less flirty than before.
OK, call me shallow.