Does a light, viscous fluid that exits after urination necessitate ghusl, given that it could possibly be semen due to intense heat, and knowing that this recurs? Also, is it permissible to intentionally ejaculate to resolve this issue?

The fluid you are referring to is not semen (maniyy). Rather, it is either wadyy, which is a thick, white fluid that exits after urination and takes the same ruling as urine, or madhyy, which is a viscous fluid that exits upon thinking about sexual desire. Neither of these necessitates a ritual bath (ghusl (definition)). If the questioner is not certain that the exiting fluid is maniyy, then ghusl is not obligatory, because the default is non-obligation. Furthermore, the exit of maniyy without desire does not necessitate ghusl.