That's a fair question, the simple answer is 'yes', if you ask they should let you know. Of course, it's partly dependent on their personality. I would challenge you to get yourself to the point where you can read their body signs well enough to know if what you're doing is having the desired effect!

Look at this way, in school you studied to pass the hard classes right? Why would you treat a lady any different? Women are like trying to take multiple hard classes - AT THE SAME TIME! Take some time to learn how their body works and pay attention to their body language.

This is especially true when it comes to DATY! While each woman is gloriously unique, even down to how their clit responds and what it feels like at different stages of the process, there are also some universal constants that are applicable to all - learn them and then watch/feel for them.
Like the old saying goes - Practice makes perfect!