They must then bathe themselves and wash their clothes because they have touched an item that a menstruous woman has touched. This is concerning the ceremonial uncleanness which women lay under from their issues. By these laws they were taught that they were purified unto God a peculiar people. They were also taught to preserve the honour of their purity, and to keep themselves from all sinful pollutions. You should be concerned with what the scriptures say about women instead of what people say about women.
Some christians have opinions that differ from the Bible.
Mr. Al-Kadhi makes some incorrect assumptions here. It doesn't say that Onan was married and it doesn't say that Tamar didn't give consent. He must marry the girl, for he has violated her. The difference seems to be that the girl in verse 25 is engaged to someone else, so the rapist has wronged not only the woman but her betrothed husband. He is punished as an adulterer would be.