During pregnancy, more blood flows to the womb for the fetus to grow. Blood flow generates heat. The body’s temperature rises when there is more blood circulation and stronger blood circulation throughout the body. The inner thighs of the woman are warm and they warm up or cool down as the woman goes through her menstrual cycles. The inner thighs also retain most of the body heat although when the nurse comes to take one’s temperature, she would usually put the thermometer under the tongue, under the arm pit or in the anus.