Ah, then in that case you obviously misinterpreted the passage.
In the context, the Pharisees brought the woman to Jesus to catch Him on a matter of the law. Their problem was that they were not fulfilling the requirements of the law which was that both parties in the adulterous affair were to be stoned to death (Lev. 20:10). They only produced the woman. Clearly justice could not be done in this case. An accuser had to cast the first stone (Deut. 17:7), but since no accuser was innocent with regard to the facts and procedure in the case, no one was suitable to cast the first stone.
The watch word still is “go and sin no more”, not “take the adulterous partner as your new wife.”