Amit Soussana, an Israeli lawyer, was abducted from her home on Oct. 7, beaten and dragged into Gaza by at least 10 men, some armed. Several days into her captivity, she said, her guard began asking about her sex life. Ms. Soussana said she was held alone in a child’s bedroom, chained by her left ankle. Sometimes, the guard would enter, sit beside her on the bed, lift her shirt and touch her, she