If MSOG isn't advertised or readily researchable in reviews, then ask. For the longest time, I simply just read the reviews but would be hesitant to ask. Not anymore. As I've become more experienced in the hobby, I've found if you respect the ladies and build up a level of trust, then asking sensitive questions is okay. Of course, like everything else in this hobby, it is YMMV. After all, there are some militant providers out there who simply won't answer questions nor do they want questions. I just avoid those providers
If the provider you want to see is one that you really want to see and you have questions about certain activities, there's no harm in asking. After all, you will never know unless you ask. As for MSOG, for some of us it is a physiological necessity.