Are there any drawbacks to making ghusl immediately after becoming junub; is it necessary to wait for a few minutes?

Are there any drawbacks to making ghusl immediately after becoming junub; is it necessary to wait for a few minutes?

Dear Brother / Sister,

After ejaculation, it is necessary to wait a bit, to urinate, to sleep or to walk so that the leakage of semen will stop completely. For, the leakage does not stop immediately since it comes slowly. However, it is not necessary to wait for a long time. A few minutes will do. 

If a person who has had a wet dream or who has had a sexual intercourse makes ghusl without urinating or walking or sleeping and if semen comes out, he needs to make ghusl again. However, the semen that comes out without lust after urinating or walking or sleeping does not necessitate ghusl. For, semen comes out without lust in that case.

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