Why should you be embarassed?! Would a women get embrassed if she got goosebumps or if her nipples got hard, etc?
Men and women clients can and do occassionally get the sheets wet with vaginal lubrication, pre-ejaculate fluid and rarely ejaculate fluid.
It's part of nature, it's part of phsyiology, and any MT who would get upset isn't a professional.
Although it is more rare in males, both sexes can experience climax without touch, so it shouldn't be much of a stretch for a male to experience climax while having his sacrum and glutes massaged. It's also possible for males to experience ejaculation without orgasm, as well as either without tumescence.
If your massage therapist acted innapropriate afterwards, meaning she acted offended, made a rude comment, or said anything that made you uncomfortable about ejaculating, you should fire her for being unprofessional, and tell her off royally before you leave. Do not tolerate without comment such rude behavior.
Just like a doctor, those of us who have been practicing for awhile eventually see it all in both sexes, so instead of being upset and embrassed, rejoice that you can do something most guys can't and move on to things more important in life.
[This message has been edited by Sally (edited 04-15-2001).]