Some relevant videos that can help to better understand what tantra (massage) means.
In the first 3 fragments, Christophe gives a tantra massage to Evelien and Saskia, to give an example of how someone can respond during a session. These reactions can vary greatly per person, and even for the same person per different session!
Note: There is no guarantee that someone will experience certain effects. This depends on various factors (see also explanation Tantra massage).