Scientifically this is called a “parasympathetic” response, it usually occurs

during periods of deep relaxation or even sleep. It is nothing to be

embarrassed about, or even nervous about. If it should happen to you

during a massage your therapist will most likely change technique slightly

and continue with the massage. Many men become so concerned about

non-sexual erections they avoid massage altogether, which is unfortunate

as it is very common, and not an issue with the therapist at all.

Therapists do have the right however to end a massage if they feel a

client is making sexual advances during their massage or is asking for

inappropriate contact.