بسم الله الرحمن الرحيم
The wetness which discharges in the beginning of excitement and increases the lust is called madhi. It breaks wudhu and does not make ghusl wajib. But the wetness which discharges after orgasm is called mani. It lessens the excitement and makes ghusl fardh.
Allah knows Best!
Darul Uloom Deoband
This answer was collected from the official ifta website of Darul Uloom Deoband in India.