I've noticed that too. Weekends usually aren't available with most women but it seems like usually you just have to schedule further in advance. If they have a full time job out of the hobby Im sure they like a day to relax before going back to work. And I've met a few ladies that share custody of their kids and obviously won't take appointments at that time.

most providers are catholic

I have been with several Tampa providers who are usually available on Sunday, all who I would highly recommend, including Lisa (TER 61231, outcall only on Sunday), Annie (TER 135017) and Rochelle (TER 134891).