From a hygienic point of view, many women are more comfortable with oral measurement, that is, in the mouth under the tongue . In any case, the thermometer needs to be cleaned to avoid infections, but after measuring in the vagina or anus, the thermometer needs to be especially thoroughly washed . However, if you want the most accurate values with minimal deviations, it is more appropriate to choose the measurement in the vagina or anus. The reason is the distorted values of the basal temperature in the mouth due to the constant change in the environment.\r