Does Ghusl become Farz?

A person had erotic dreams but upon waking up, he did not see any discharge. So, Ghusl is not obligatory on him. On the contrary, if he did not have any erotic dream but upon waking up, he found some traces on his clothes then, in this case, Ghusl is obligatory on him.

It should be noted that if the Ghusl of a person is invalidated due to erotic dreams, his fast is not invalidated. He must just perform Ghusl and continue with the fast. However, he should not exaggerate when putting water in his throat or nose while performing Ghusl because he risks breaking his fast if the water goes down his nose or throat.

[English version of "Eski roussal vine faraz ?" – Al Jamiat – Vol.2 No.10]