Go talk to a GYN. After birth, they tell you not to have sex for 40 days, because the women is unclean, and has an open wound that can get infected.
No Gynocologist would ever tell that the woman was 'unclean'. They'd tell you that sex would be painful, and possibly damaging, for the women and it was best to let it heal. These are not in the least bit comparible.
What a remarkable lack of understanding of your own holy book you have, Rat! Apparently you lack any understanding of what 'unclean' means in the context of the old testament; here's a clue, it means a whole load more than 'dirty'.
If your problem is with anal sex, are homosexuals who don't practice anal sex just fine? What about lesbians (who are not even mentioned in the bible)?