Does the excretion of fine, cohesive white threads with urine when there is unfulfilled sexual desire necessitate ghusl for janabah or only wudu?

The semen that necessitates ghusl (definition) (ritual bath) is that which exits in a gush with desire. It is a thick white fluid for men and a thin yellowish fluid for women. Its expulsion is accompanied by pleasure and followed by relaxation, and its smell is like that of palm spathe. As for the threads you asked about, they are not considered semen; it appears they are from the wadī (post-urination discharge).