The headline grabs your attention but there’s far more important imformation here:
e.g. Female sex drive, hormones, the menstrual cycle and breathing
The female sex drive can vary in line with the menstrual cycle. One reason for this is that the hormone progesterone affects breathing. The levels of progesterone are typically higher between the 15th and 28th days of the menstrual cycle. A high level of progesterone increases breathing and, therefore, the outflow of carbon dioxide. About a week after ovulation, around the 22nd day and for a few days after, carbon dioxide levels are usually at their lowest. This low level can contribute to a reduced sex drive due to the association between low carbon dioxide levels and worsened oxygen uptake in the body. If the carbon dioxide level is already lower than normal around ovulation, due to stressed breathing, then the increased progesterone level results in even lower CO2 levels, impacting the sex drive even further.
Low carbon dioxide levels acts on smooth muscles to tighten them, and as the uterus comprises smooth muscles, these low levels can contribute to menstrual pains caused by cramping muscles in the uterus. Women normally feel their best between the 1st and 14th days of the menstrual cycle, which coincides with the blood carbon dioxide levels being at their highest (and progesterone levels at their lowest). The last week of the cycle is normally the worst, which coincides with carbon dioxide levels being at their lowest (and progesteroen levels at their highest).