Ibn Majah

Benefits and Issues:
(1)
On the 10th of Dhul-Hijjah, four acts are performed:

(a)
Stoning the large Jamrah.

(b)
Offering the sacrifice.

(c)
Shaving the head.

(d)
Performing the Tawaf al-Ifadah.

This sequence of the four acts is Sunnah.
However, if this order is not maintained, the Hajj is still valid and no expiation (fidya) or the like becomes obligatory.

(2)
Stoning the Jamrah is the first act.
With its completion, the state of ihram is lifted.
Therefore, Tawaf al-Ifadah is performed in regular clothes.

(3)
Marital relations are not permissible before performing Tawaf al-Ifadah.

(4)
If Tawaf al-Ifadah cannot be performed before Maghrib on the 10th, it can be performed later.
However, for this, it is necessary to re-enter ihram before Maghrib on the 10th. (Sunan Abi Dawud Hadith: 1999)
Nevertheless, until this Tawaf is performed, the restriction on marital relations remains in place.

(5)
A man may use any kind of perfume, provided that he has exited the state of ihram.

This pertains to the 10th of Dhul-Hijjah. Upon arriving at Mina from Muzdalifah, only the Jamarah Aqabah is to be pelted. After this, if the pilgrim possesses a sacrificial animal, it should be slaughtered. The state of ihram is now ended. He should now have his hair cut, bathe, cleanse himself, apply perfume, and wear stitched clothing; even the Tawaf az-Ziyarah (the obligatory circumambulation) will be performed without ihram. However, intercourse with one's wife is prohibited before performing Tawaf az-Ziyarah. Once he has performed Tawaf az-Ziyarah, then his wife also becomes lawful for him. The Messenger of Allah (sallallahu alayhi wa sallam) has declared the Day of Sacrifice (Yawm an-Nahr) and the Days of Tashreeq as days of eating, drinking, and remembrance of Allah. See: (Sahih Muslim, Kitab as-Siyam, Hadith: 1141)