Different countries, different opinions and also different advertisement!
In Holland animal shelters, animal protect organisations and vets make advertisement for sterilization and castration with slogans like this:
“Protect your female against pyometra and mama gland tumors by sterilisation!”
(For males they use only castration for females two methods are used: ovario-hysterectomie (OVH – everything is deleted) and ovari-ectomie (OVE - the uterus is not deleted)