Conjoined twin Carmen Andrade is tired of people asking questions about her sex life - or how it affects her sister, Lupita. The twins, 25, have taken multiple opportunities to answer questions from curious fans about how they operate as two separate people despite sharing a circulatory, digestive and reproductive system. But Carmen sees no need for the questions to get too personal. "I don't understand why people need to know about my private parts in order [to] humanize us," she told People in a story published Thursday, September 18.