필수 체크박스

1개만 선택, 다중선택불가능하게 하려면 어떻게 해야하나요?

<div class="kboard-attr-row kboard-attr-checkbox meta-key-5d9602d34382d required">
		<label class="attr-name" for="5d9602d34382d"><span class="field-name">성별</span> <span class="attr-required-text">*</span></label>
		<div class="attr-value">
			<input type="hidden" name="kboard_option_5d9602d34382d" value="">
			<label class="attr-value-label"><input type="checkbox" name="kboard_option_5d9602d34382d[]" class="required" value="남자">남자</label>
			<label class="attr-value-label"><input type="checkbox" name="kboard_option_5d9602d34382d[]" class="required" value="여자">여자</label>
			
		</div>