Short answer: No. In Jainism, lay (household) members are expected to observe celibacy (brahmacharya) to the extent appropriate for householders, and sexual relations outside a lawful, faithful marriage are not in line with the vows and ethical aim of Jain practice.

What this means in practice:

• Householders take anuvratas, including celibacy within the context of a committed marriage. Extramarital or casual sexual activity is discouraged or considered inappropriate.
• Sexual relations are ideally confined to a faithful marriage and approached with restraint, non-harm, and mindfulness of karma.
• The strongest, ascetic path (for monks/monastics) is complete celibacy, but householders are asked to live with fidelity and self-control in daily life.

If you’d like, I can explain how Digambara and Śvetāmbara interpretations describe householder ethics in more detail.