How can a person afflicted with epilepsy maintain their prayers and the purity of their body, especially since seeing real women causes a viscous fluid to be discharged from him? Is ghusl and changing clothes required every time this fluid is discharged?

Prayer is never waived for a mature, sane Muslim under any circumstances. Abandoning it is a grave sin that exposes one to Allah's wrath and punishment. Sincere repentance is obligatory, as is making up all missed prayers; this is the view of the majority of scholars. As for the fluid that exits from you, it appears to be madhiy (pre-seminal fluid), which does not necessitate ghusl (definition) (ritual bath) but rather wudu' (ablution) after washing whatever parts of the body it has touched. It is more cautious to wash the penis and testicles, and it suffices to sprinkle water on the clothes.