I think the cause of loss of libido for so many bros' wife after bearing kids could be due to c-section.
According to this
website , c-section 'cut the vagal sensory nerves in the pelvic area (clitoris, uterus, cervix and vagina), which are responsible for transduction of the sex organ stimulation to the dopamine-hypothalamus-pituitary axis for the release of oxytocin, essential to the vaginal lubrication and relaxation and ultimate orgasmic responses. '
In simple english, it means c-section could damage nerves responsible for sexual response and orgasm.
And
this is quite similar to TS's case.