글쓰기 여분필드 라디오버튼 필수입력 문의요

        <tr>
            <th scope="row"><label for="wr_1">성별<strong class="sound_only">필수</strong></label></th>
            <td><input type=radio name="wr_1" required class="frm_input required" value="여성" <? if( $write[wr_1] == "여성" ) echo "checked"; ?>>여성&nbsp;&nbsp;<input type=radio name="wr_1" required class="frm_input required" value="남성" <? if( $write[wr_1] == "남성" ) echo "checked"; ?>>남성</td>
        </tr>
​

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말 그대로 여분필드로 라디오버튼을 사용했는데....필수입력이 안되네요...