Is ghusl or wudu required for prayer when the penis becomes erect and fluid is discharged during foreplay with female children?

You must fear Allah and abandon fondling children, for that may lead to obscenity. Allah has forbidden immoralities and everything that leads to them, as He, the Almighty, says: "And do not approach immoralities - what is apparent of them and what is concealed," and "And do not approach unlawful sexual intercourse. Indeed, it is ever an immorality and is evil as a way."

What you are doing arouses lust, which is not permissible to fulfill except with one's wife or a slave woman, as Allah, the Almighty, says: "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 they are the transgressors."

Regarding what comes out of you: If it is semen (discharged with gushing and great pleasure, followed by relaxation), then you must perform ghusl (definition) (ritual bath). If it is madhiy (pre-seminal fluid, not gushing and not thick), then you must wash the area it touched and perform wudu (ablution).

We advise you to hasten to marry if you are not married, as it is the way to protect oneself and curb lust.