What is the non-viscous white fluid that exits the penis during sexual thoughts and foreplay, and does it necessitate ghusl?

It appears that what was discharged is madhiy, which is a thin, sticky, white fluid that is released upon arousal, but not with lustful gushing, nor is it followed by fatigue, nor does it necessitate ghusl. Both men and women experience it. It should also be noted that fondling the private parts and indulging in forbidden fantasies are a means to that [i.e., to the forbidden].