Buddhists don't have "commandments" we have precepts for conduct. Here is the one on sexual misconduct:
"Aware of the suffering caused by sexual misconduct, I undertake to cultivate responsibility and learn ways to protect the safety and integrity of individuals, couples, families, and society. I am determined not to engage in sexual relations without love and a long- term commitment. To preserve the happiness of myself and others, I am determined to respect my commitments and the commitments of others. I will do everything in my power to protect children from sexual abuse and to prevent couples and families from being broken by sexual misconduct."