I'll go with the old adage: ' when you're poking the fire, you're not looking at the mantlepiece'.
If that's your attitude, surely you'd be better off having a wank
To be honest, I find it a bit dehumanising, but that's your choice I guess.
In response to the OP's request, I can't think of a single SP in Dundee I'd trust to provide a good outcall. Better to wait for a touring girl to turn up, although they are very thin on the ground these days, and request an outcall from her. I believe Mature_Petite is a regular visitor now. Might be worth a try.