Nubie question, what is this "swipes" thing I've heard people saying about?
Also, how do you get to know about the HE cost, did you just book the massage and pay up front for that, then when she said about HE, do you get the additional cash out and give it to her up front? Where to you pull the cash from? 
Imagine the old machines where your credit cards had to be swiped....now imagine you arse as the credit card machine.

In the case of toftt, when it's not known whether the massage is legit, don't offer money or talk about extras at the beginning. You may be shown the door.
You just have to judge on the progress of the sensuality of the massage, or other indications...comes with experience.
There's another lengthy post somewhere about that.
If you think extras may be available, you could risk offending the lady by politely asking, or you could wait to see if she offers. Some punters always try and push the boundaries on toftt punts, but others prefer to just see what happens.
Lying there with a big hard on can help to broach the subject.
If extras are discussed, she'll usually give a list and prices.
Some ask for money first, which we usually hate as it requires a three legged walk over to your kecks in semi darkness, without your glasses, to route out your money...quite a passion killer.
Others will accept it after the massage ends.