Sort of, it wasn't a sporting goods store, but they did sell swimwear, and the staff was very attentive to my needs: "I think you probably need the ones with the pouch," he said as I was browsing the rack. The next time I came into the store, he saw me, and said he had been saving an item for me, which he brought to me after I had entered the fitting room with other things to try on.
Have you ever had (female) hookers, who surely recognized you were gay, comment on the bulge and ask to see your cock, as you were walking home from the club/party?
Bonus HYE: Have you ever pulled it out on the street, on at least some occasions, to show them?