Sir: Mohammed al-Masari is incorrect in stating that "[Muslim] women must submit to sex with their husbands at any time, in any manner". Oral and anal sex are completely forbidden according to Islamic law. Furthermore the wife has as much right to sexual satisfaction as her husband (Imam al Ghazali) - The Muslim Marriage Guide by Ruqaiyyah Maqsood (Quilliam Press).
May I quote from the Prophet Mohamed's last sermon:
Hear me well! You have rights over your wives and they have rights over you!
Thank you very much on behalf of the thousands of Muslim women and girls we counsel each year.
Muslim Women's Helpline