Sadly Southwell is a bit of a Desert for any action, I have been to races many times and tried !However, about 15 min drive in different directions will find Sexysweetmarie , who is very accommodating and possibly suits your requirements, or towards Newark you will find Charlotte -Newark , a little on the large side when I saw her last, but everything was available , although she is big in to horse racing and may even be at Southwell and you could get some action in a horse box -lol
good luck ,pls post if you find any hidden treasures I have not yet discovered