R' Jacob Farkas wrote:<br><The Torah was uncomfortable with the old method, and Hazal took note of that, and <pre><ultimately banished the practice by prescribing a strong punishment.<br><br>Where do you see that the Torah was uncomfortable with kiddushei biah? If that was the case why didn't the Torah change the din and disallow kiddushei biah? There are many things that were permitted before matan torah which are now assur to us. The fact that the Torah did not disallow kiddushei biah seems to imply that the Torah had no problem with it. If so why did Chazal ban it? Probably for the same type of reason that we no longer do Yibum. Chazal felt that people would do it shelo l'shem mitzva of have pritzusdik kavanos and therefore banned it.
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