If a person has intercourse with his wife after the first stage of exiting Ihram and before doing Tawaf Al-Ifadah, he is sinful but his Hajj is not rendered invalid. He should go out of the Haram zone in order to enter Ihram anew, and do Tawaf Al-Ifadah. He also has to slaughter a sheep, and distribute the meat to the poor of the Haram, and not eat any of it himself.

Putting perfume on the head and body at the time of entering ihram – i.e., after doing ghusl and before forming the intention of entering ihram – is Sunnah.

The pilgrim in ihram should not comb his hair, because what the muhrim should be is dishevelled and dusty, but there is nothing wrong with him washing his head.