The phrase for 'intercourse' in this verse has been interpreted by Hanafi scholars to mean sexual contact, while Shafi'i scholars interpret contact to mean both physical and sexual contact.
After washing away the semen or blood from the body and after niyyat, the whole body should be completely immersed in the water all at once, not gradually.
Ghusl is often translated as "full ablution", as opposed to the "partial ablution", of wudu O Believers, do not come near to prayer when you are drunk, until you know what you are saying; nor when sexually defiled, unless passing through, until you perform ablutions.
If you are ill, or on a journey, or one of you comes from the toilet, or you had intercourse with women, and you do not find water, then use some clean earth and wipe your faces and hands.
If one has forgotten to rinse the mouth or the nostrils, these too could be rinsed when recalled after Ghusl has been performed.
The following hadith describes how ghusl should be performed by Sunni Muslims.