Where are the lighthouses?

Jennifer's friend has two sisters. We all live in Texas. The sisters approached my friend and asked where the lighthouses were.Ê When my friend tried to probe a little bit, the sisters told her, "Yeah, they're good paying jobs and have lots of ads in the paper, but we don't know where the lighthouses are to apply." My friend told them there are no lighthouses in Texas. "Let me see that newspaper." Sure enough, there were ads for "Light housekeeping needed. Apply in person."