Embarrassing things happen sometimes to all of us, but there is no reason to let it ruin your session. Massage therapists work with bodies on a daily basis and understand that things happen which are beyond our control. Men get erections, women have menstruation, and we all experience flatulence, drooling, and snoring.
We know that men can get erections sometimes during a non-sexual, therapeutic experience. This does not necessarily mean that the person is aroused or inappropriate. Touch administered to any part of the body can activate the parasympathetic nervous system, which can result in an involuntary reaction. An educated, professional massage therapist understands this, and it will not be an issue for him/her. Discretion and professionalism will be maintained. If you are still concerned, consider wearing fitted underwear to make you feel more secure. Or feel free to ask for a weighted towel or blanket to drape across your pelvic/hip region. The added weight can provide a feeling of security and will calm the nervous system, decreasing the likelihood of an involuntary erection.
It is understandable that women tend to be nervous when receiving a massage during menstruation. Though they are infrequent, accidents do happen. Again, it’s part of life, but as medical professionals, we are used to dealing with these things. If you have concerns, just make sure you wear something that makes you feel secure and talk to your therapist if you are feeling uncomfortable at any time during your session.
As for gas, drooling, and snoring, it happens to everyone.