When you say 'fucking machines' what kind are you talking about, the black and decker drill with dildo on the end seriously what kind of stuff as I may try this on my next punt.
A little more hardcore than that - I have two in fact, my mate Lou - the
External Link/Members Only or "lurve lilo" as MissKDD christened it. Great for DP's. I have the older model which was £20 cheaper but only has one speed - can be a bit intense or so I've been told. Have had three escorts squirting from using this so can't be bad. The newer version has three speeds. It's battery powered takes those big D type batteries. You will also want to invest in a mains powered pump to blow it up - I imagine doing it by hand with the pump provided would be a killa.
Then there's my
External Link/Members Only which is more of a "proper" fucking machine - very adjustable speed and also angles. Two of my regs have bought one of these for themselves they enjoyed it so much. You can buy a fleshlight attachment for - ahem - self amusement but although it sort of does the job and makes a nice change from your hand it's not all that. Still for £35 might be worth investing in.
And yes, believe it or not I have actually taken them out to incalls, but this is one of the reasons I much prefer outcalls.
These are the best I have found for that kind of money - they are not professional quality as you see in porn movies but not far off and definitely do the job.