As I mentioned before, I really can understand the hesitation. Perhaps an alternative approach for the curious is to purchase a prostate massage toy, such as:
http://www.aneros.com/prostate-massagers/sgx/
For $50 you could experiment in privacy, determine if you enjoy the sensation or not, and go from there.
Personally I enjoy both; sometimes a skilled manual massage from a lovely lady, and sometimes the sensation of the toy.
And ladies, to offset any concern this suggestion distracts some men from coming to you for the service, I highly recommend both in combination: the toy doing it's thing, leaving the lady's hands free to do whatever the moment might call for. (In my case, usually bound behind the back in some fashion.)