Dare I say (don’t pounce) it could sort out your availability (it could even do things like confirm your likes and dislikes, parking, nearest tube - you can define the scope of the pre-qualification)- you could then call to confirm (I.e. check you are happy with them, and then confirm address), retaining the part which is righty so important.
But you are simply inserting more steps and barriers between sex workers and the clients.
Current method:
1 Client sees advert
2 Rings or texts for booking
3 We screen to our own requirements and arrange or deny the booking, giving the client all the info needed
4 Booking happens
You're suggesting:
1 Sex worker installs your app
2 Client installs your app
3 Client sees advert
4 Client PAYS to contact sex worker with suggested time and duration of booking (AS IF!)
5 Sex worker reviews booking request
[IF AVAILABILITY]
[IF request <> available THEN]
6 Sex worker suggests alternate time for booking because in the meantime someone has contacted via the usual straightforward method and requested that time slot
7 Sex worker contacts client (using own minutes on phone?!) and does screening as usual
8 Client gets pissed off because he's PAID to contact sex worker so feels entitled to just rock up at the requested time
9 Sex worker tells client to fuck off with that attitude
10 Client does a chargeback for the money he paid you
[IF request = available THEN]
6 Sex worker contacts client (using own minutes on phone?!) and does screening as usual
7 Booking happens
8 Client wonders why the hell he paid you to contact a sex worker when he could have just phoned
[END IF]
Your app would DOUBLE the steps that most bookings currently take.
I gave this advice to someone on one of the threads on Amy's first reply.
You are approaching this from the viewpoint that it should be something like bookatable or Uber - the idea being that there is an unlimited (or a large) supply of sex workers. But for indies, there's just one. The other assumption is that we will see anyone who wants to see us, which is so far from the truth that it's laughable.
However your app, with some tweaking, might be suitable for
pimps an agency, one that has a lot of girls on the books.