This never made any sense. The whole thing relies on assuming Chuck's business had a name similar to the Feed and Seed that was established later. Although this is supposed to be inferred by the viewer, there is no evidence of this being the case. For all we know, the business could have had an entirely unrelated name like Chuck's Used Wagons. We still don't know what it was called with one hundred percent certainty. Besides, wouldn't such an implied "adult business" attract excessive attention and notoriety in the town of Springfield? Yet no such business has ever been featured on the entire show. No one has ever mentioned it prior. There is only the vague implication that such a business might have been active at one point in time, which seems rather unlikely given the mostly conservative nature of Springfield. Though such a business could have existed, it appears rather improbable that it even would have, as if we were only meant to take it on faith that such a business ran in the first place.