The way by which one catches MC is not known. Our writer's doctor is correct that they are not a sexually transmitted disease, and I see no reason for her to allow this to interfere with her love life. They commonly appear in children, and often will not be spread to other members of the household. MC is often not treated, and will disappear spontaneously over a period of months. However, many people, like today's writer, are unwilling to wait, and because the bumps may be cosmetically unattractive, I can understand.
Treatment consists of traumatizing the lesions, and it can be done in a number of ways.
The bumps have a core, which can often be picked out by a small curette. The tip of a small knife blade could be used. It need not be sharp, since one wants to pop or pry out the core of the lesion, not cut it out. I have often treated them by lightly freezing the bumps with liquid nitrogen, and I know many dermatologists will lightly cauterize the lesions. They should heal without leaving a scar, unless cautery has been used too vigorously.