”Sunnah seems to say so”
Allah gave our prophet the best death a man can think of, he died while making love to the one he loved to make love most..
Proof that he died during an explosive moment:
Ibn Hisham page 682:
….that he heard Aisha say: “The apostle died on my bosom during my turn: [of having sex with]. It was due to my ignorance and extreme youth that the apostle died in my arms
Narrated ‘Aisha:He died on the day of my usual turn ( of having sex) at my house. Allah took him unto him while his head was between my chest and my neck and his saliva was mixed with my SALIVA. Sahih Bukhari, Volume 7, Book 62, Number 144:
Aisha is blaming her youth and ignorance for causing Prophet’s death . Aisha’s eager cooperation excited Prophet immensely which lead to a wild session of foreplay and tongue action followed by intensive sex . Due to her inexperience she could not see the danger of an old man performing sex with a young woman during his serious illness. Timely slowing down or stopping him could have saved his life. Prophet had an expolsive climax which his old and sick heart could not handle and went in a cardiac arrest. She saw him die and slump on her bosom during his moment of extreme pleasure. ( which is not uncommon in such cases). That is why she felt guilty of causing his death..
He did not recite KALIMA at death
The hadiths indicate that instead of having kalima on his mouth like a good muslim during his last moments , prophet’s mouth was busy in tongue action and and French kissing.
His body must have stiffened as he died during his pleasure moment in an “as is” condition. The fact that they tried to cover him with triple shroud indicates an embarrassing bulge which they must have tried to even out by extra layers of clothings. They wouldn’t have wanted all to know what their prophet was upto when he died.
Narrated Abdullah ibn Abbas: The Apostle of Allah (pbuh) was shrouded in three garments made in Najran: two garments and one shirt in which he died. Dawood, Book 20, Number 3147
Apparently neither the three clothing layers nor the reported delay in burial helped in the situation and he was buried quietly where he was making love