السلام عليكم ورحمة الله وبركاته احسن الله اليك What is the ruling on deliberate sexual thoughts? e.g. a man thinking about marriage life and being intimate with his 'wife' although he's not married?

Ustadh AbdulAziz al-Haqqan
Shouls be avoided as many of the ulama mentioned it is forbidden to do so intentionally rather than a fleeting thought that u cant control.