What is the reason for the discharge of a clear fluid only after masturbation instead of yellow semen, and is this related to uterine disease and infertility, and is ghusl obligatory in this case?

Mani (sperm/vaginal secretions) is what is usually discharged with pleasure, followed by relaxation. For women, it is yellow or white, and ghusl (ritual bath) becomes obligatory because of it. As for Madhiy (pre-ejaculatory fluid), it is a thin, sticky, white fluid that is discharged during arousal, but not with pleasure, not gushing, and not followed by relaxation. Both men and women experience it. Furthermore, masturbation is forbidden in Sharia, based on the Almighty's saying: "And those who guard their private parts Except from their wives or those their right hands possess, for indeed, they are not to be blamed - But whoever seeks beyond that, then those are the transgressors."